The primary objective following harvest is to preserve functional green foliage for as long as possible before a killing frost.

• Assess Disease Pressure: If your vineyard remains relatively disease-free through harvest, post-harvest fungicide applications may not be necessary. However, if disease pressure was high late in the season, targeted fungicide applications can help protect healthy foliage, limit further disease spread, reduce pathogen sporulation, and minimize overwintering inoculum. Applications are most effective when made at the first signs of infection, as the disease becomes harder to manage once established. Avoid using single-site post-harvest fungicides to control widespread, heavily sporulating infections, as this may increase the risk of fungicide resistance. Always follow label recommendations and apply fungicides only under favorable spray conditions to ensure effective coverage and disease control.
• Downy Mildew (Plasmopara viticola): Check leaf undersides for white, downy sporulation. Severe late-season downy mildew can cause rapid, premature defoliation.
  • Protectants: Captan (FRAC M4) or Mancozeb (FRAC M3; observe annual limits).
  • Post-Infection / Systemics: Phosphorous acid formulations (FRAC 33), Forum (FRAC 40), or Zampro (FRAC 40 + 45). Phosphorous acids are widely used late in the season to suppress active infections.
• Powdery Mildew (Erysiphe necator): Powdery mildew appears as dusty white patches on upper leaf surfaces. It requires 4 to 6 weeks of frost-free weather for powdery mildew to produce overwintering structures (chasmothecia).
  • Management: Applications of JMS Stylet Oil, Quintec (FRAC 13), or Torino (FRAC U6) suppress late-season sporulation. Note: Do not apply oils within 2 weeks of sulfur or Captan applications.
• Vineyard Sanitation: Remove dried, diseased clusters (“mummies”) from canopy wires and floors where feasible to eliminate primary overwintering inoculum for black rot and Phomopsis.

Late fall, before leaf senescence, is the single best window for identifying systemic bacterial, viral, and phytoplasma infections, as foliar symptoms are most pronounced at this time.

• Symptom Identification: Walk your vineyards and look for key indicators:
  • Grapevine Viruses (Leafroll & Red Blotch): Interveinal reddening on red cultivars or yellowing on white cultivars, downward leaf rolling, and delayed cane lignification. See also Rutgers Fact Sheet 1260 Red Leaves in the Vineyard: Biotic and Abiotic Causes.
• Action Steps: Because there are no curative chemical treatments for systemic pathogens, infected vines act as continuous local inoculum sources. Symptomatic vines should be flagged immediately and rogued (removed). Samples can be submitted to Michigan State University Plant Diagnostic Clinic for confirmation before removal.

While most general insecticide applications cease post-harvest, specific phloem-feeding pests require attention before winter.

• Grape & Vine Mealybugs: Mealybugs feed on phloem, excrete honeydew that promotes sooty mold, and serves as the primary vector for Grapevine Leafroll-associated Viruses (GLRaV). High fall populations warrant targeted control using products such as Movento (spirotetramat), Assail (acetamiprid), Actara (thiamethoxam), or Applaud (buprofezin).

Special Focus: Spotted Lanternfly (SLF; Lycorma delicatula) & Canopy Depletion
Adult activity peaks post-harvest, creating significant management challenges in Mid-Atlantic vineyards.

• Impact on Carbohydrate Reserves & Winter Hardiness: SLF adults are heavy phloem feeders. Mass aggregation in late summer and fall drains carbohydrates and nitrogenous compounds directly from vines right when these reserves should be translocating to roots and trunks. High SLF feeding pressure may reduce vine cold hardiness, leaving buds and vascular tissue vulnerable to critical winter temperatures.
• Managing SLF Under Variable Crop Loads:
  • Reduced Crop Load / Stressed Vines: In years where vines experienced frost damage, hail, or heavy disease pressure leading to lower crop loads, growers might assume vines need less protection post-harvest. This is a misconception. Vines with reduced crop load that are heavily fed upon by SLF may still suffer severe carbohydrate depletion. Protection remains critical to ensure vine recovery for future years.
  • Post-Harvest Control Thresholds: Scout vineyard borders daily during peak adult flight (September through October). Apply effective insecticides with long residual activity (e.g., dinotefuran, bifenthrin, carbaryl) to control remaining adults and reduce egg-laying in the vineyard. Focus on vineyard perimeters where adults are most likely to aggregate from surrounding wooded areas.

Fall is a critical season for controlling established perennial weeds and reducing weed pressure before winter. Effective fall weed management also helps maintain a cleaner under-vine strip through late winter and early spring, which can improve the performance of residual herbicides applied in spring by allowing more uniform deposition of herbicides on the soil surface.

• Systemic Postemergence Herbicides: Fall is an important window for controlling established perennial weeds because actively growing plants are translocating carbohydrates to roots, rhizomes, and other perennial structures. Systemic herbicides applied while sufficient green foliage remains can move with these carbohydrates, improving control of perennial weeds. Glyphosate products labeled for grapes can be particularly useful for susceptible perennial broadleaf and grass weeds in well-established vineyards. Grass-selective systemic herbicides labeled for grapes, including Poast (sethoxydim) and clethodim products, can be used where perennial or annual grasses are the primary target. Herbicide selection and rate should be based on the weed species present and the current product label. Maintain adequate foliage to ensure herbicide uptake, and avoid mowing immediately before treatment. Directed applications should prevent contact with grape foliage, green bark, suckers, or other susceptible vine tissue as specified by the label.
• Residual Herbicides: Late-fall residual herbicides can suppress winter annuals and provide a cleaner under-vine strip going into spring. Options labeled for vineyard use include Chateau (flumioxazin), Alion (indaziflam), Matrix (rimsulfuron), and Prowl H2O (pendimethalin). Product selection should be based on vineyard age, soil characteristics, target weed spectrum, previous herbicide use, and label restrictions. Residual herbicides should reach the soil surface and generally require rainfall or irrigation for activation. Alion (indaziflam) is particularly well-suited to fall applications. Because indaziflam is relatively immobile in soil and requires more rainfall or irrigation than many other residual herbicides to be adequately activated, applying it in late fall provides a greater opportunity for winter precipitation to activate the herbicide before spring weed emergence. Rutgers Research and Extension recommendations have shown more consistent weed control with fall applications than with spring applications. For best performance, apply Alion to a clean, settled soil surface and follow all vineyard-specific restrictions on vine age, soil texture, organic matter, root-zone depth, and timing relative to hilling or other soil disturbance.
• Preparation: If dense vegetation or accumulated plant residue interferes with soil coverage for a PRE treatment, mow or remove excessive vegetation before application. Avoid directing herbicide sprays onto green bark, foliage, suckers, exposed roots, or other sensitive vine tissue where prohibited by the label.
• Resistance Management: Rotate herbicide sites of action and integrate POST, PRE, mowing, cultivation, and other cultural practices where appropriate. Avoid repeated reliance on the same residual herbicide program year after year.
• Cover Crops: If establishing fall cover crops in row middles, seed soon after harvest while soil temperature and moisture remain favorable. Keep herbicide placement confined to the under-vine strip when products could interfere with cover-crop establishment.
• Hilling-Up and Residual Herbicides: Hilling and de-hilling disturb the treated soil surface and can disrupt the herbicide barrier created by fall-applied residual herbicides. Therefore, vineyards that are routinely hilled should coordinate the timing of soil mounding with the residual herbicide program. If hilling is planned, complete the soil-disturbing operation before applying a residual herbicide whenever the product label permits, and recognize that spring de-hilling may reduce residual control and require reassessment of the under-vine weed-management program. For effective residual weed control, apply PRE herbicides to a relatively clean soil surface with minimal accumulated vegetation, leaves, or pruning debris. Most residual herbicides require rainfall or irrigation after application for activation. Product and rate selection should reflect the target weed spectrum, soil texture and organic matter, vineyard age, and label restrictions. Fall applications are generally made after vines are dormant but before the soil freezes. Special care is required with Alion (indaziflam). In vineyards, it should not be applied before soil disturbance such as hilling or de-hilling, and application should be delayed until the soil has settled. Alion is restricted to established vineyards meeting label requirements for vine age, soil characteristics, and root-zone separation. Always consult the current product label before application.

Critical low-temperature winter events and dehardening warmth to cold cycles pose risks to Vitis vinifera and tender hybrid cultivars across New Jersey. Winter injury damages trunks and graft unions, creating entry sites for Crown Gall (Agrobacterium vitis).

Hilling-Up Graft Unions: Covering graft unions with 3 to 4 inches of soil is one of the most effective cold-protection strategies. Soil acts as a thermal mass; while air temperatures may drop below 0°F, soil temperatures around a covered graft union typically remain near 32°F. While this won’t shield unburied parts of the vine, it can preserve enough tissue to allow regrowth from protected scions. Training new shoots as new trunks and using multiple trunks per vine can reduce the risk of total vine loss. For detailed guidance, refer to Rutgers NJAES Factsheet FS1264 Hilling-Up to Prevent Winter Injury in Vineyards.

• Timing: Perform hilling-up in late fall while the soil is workable and not frozen.
• Best Practices: Raise drip irrigation lines before operating equipment; straighten bent trunks to avoid mechanical injury; ensure the soil mound extends 3–4 inches above the graft union.
• Pruning Strategies to Avoid/Reduce Winter Injury:
  • The best time for pruning is after the highest risk of winter damage has passed, typically from the end of February to March. This is specifically useful if the cold event occurs towards the end of winter. Unpruned vines can still be assessed for bud injuries and adjusted for pruning severity.
  • Delayed pruning also delays bud burst and is a frost avoidance technique. It may not be practical to prune a larger vineyard just before the green tip stage. In that case, an option is double pruning, where a rough pruning is performed atop 6-8 buds during the winter, followed by fine pruning around bud swell. However, start pruning the hardiest cultivar first and finish with the least hardy.
  • Balanced vines, neither overly vigorous nor weak, tend to have less winter damage than unbalanced vines. Canopy management can achieve balanced vines, starting from winter pruning.
  • Choosing the right location for planting grapevines is the most effective strategy. Avoid cold pockets or low spots where cold air often drains and accumulates. Weed-free strips and low mowing between aisles facilitate cold air drainage.
  • Selecting cold-hardy varieties or planting cold-tender varieties at higher elevations and late-budding/cold-hardy or hybrid varieties in low spots reduces the risk.
  • Retaining two or more trunks for cold-tender or young vines should be standard practice.
• Post-Harvest Fertilization: Avoid late-fall nitrogen applications, as nitrogen stimulates late succulent growth and delays winter acclimation. Fall is, however, an excellent time to apply compost or other organic soil amendments before the ground freezes, allowing soil microbes to integrate nutrients over winter.
• Soil Moisture: Ensure vines go into winter with adequate soil moisture to prevent root desiccation.

Target Trees: Peaches, Nectarines, Plums, and Cherries

Post-harvest is the critical timing window for borer control. Most adult flights have peaked; eggs are laid, and newly emerged larvae feed near the surface before tunneling deep into the cambium.

Biology & Key Differences

• Peachtree Borer (PTB): 1 generation per year. Attacks the trunk from a few inches above the soil line to slightly below ground.
• Lesser Peachtree Borer (LPTB): 2 generations per year. Attacks upper scaffold limbs and branches, often invading areas compromised by Cytospora canker.

Application Essentials

• Timing: Apply immediately post-harvest. Waiting longer allows larvae to penetrate deep into wood, where sprays cannot reach.
• Volume & Coverage: High volume is essential. The lower trunk and soil line (or scaffold limbs with cankers for LPTB) must be thoroughly saturated/drenched, usually requiring a dilute handgun application.
• Management Options:
  • Chlorpyrifos: Historically, the standard drench, restricted strictly to post-harvest to avoid fruit residue. Note: Due to regulatory phase-outs, availability is limited. Warhawk is one trade name that may still be available. If a dormant or delayed-dormant application is made, an additional trunk application in the same year is prohibited.
  • Pyrethroids: Various pyrethroids are labeled for borer control as alternatives, though high spray volume directed to the trunk and lower limbs remains key to efficacy.
  • Mating Disruption: Mating disruption (applied in spring) is highly recommended as an effective alternative to pesticides.
  • Trunk Painting: White latex paint applied to the lower trunk before egg laying can reduce infestations. This can also help reduce southwest injury and control injury caused by fluctuating temperatures.

Target Trees: Peaches & Nectarines

Taphrina deformans overwinters as spores on bark and bud scales. Infection occurs during bud swell in late winter when rain washes spores into expanding buds.

Management Strategy

• Timing: A single fungicide spray applied either in fall after 100% leaf drop OR in late winter strictly prior to bud-swell.
• High-Efficacy Recommendations:
  • Chlorothalonil (Bravo, Echo) or Ziram: Provide near 100% control in research trials (e.g., RAREC studies in Bridgeton, NJ). Ferbam is also highly effective.
• Fixed Coppers & Dual-Purpose Strategy:
  • Standard fixed coppers (e.g., Champ) provide fair-to-moderate leaf curl control on their own. Newer copper formulations (Kocide 3000, Nordox, Cueva, Badge X2) are also widely used.
  • Dual-Action Tip: On varieties susceptible to Bacterial Spot, use copper/bactericide formulations applied pre-bud-swell in spring (rather than fall). This timing leaves copper residue to reduce epiphytic bacterial spot inoculum right as trees enter bloom while still controlling leaf curl.

Target Trees: Plums & Cherries

Bacterial canker invades trees through leaf scars, pruning wounds, and trunk damage during cool, wet fall weather, causing dark sunken cankers and amber gumming.

Spray Schedule & Efficacy

• Application Timing: Apply sprays targeting leaf drop events when open leaf scars leave the tree vulnerable.
  • Standard Program: 2 sprays applied at 10% leaf drop and 80% leaf drop.
  • High-Pressure Orchards: If canker has been a severe problem in the block, apply up to 4 sprays at 14-day intervals through the leaf drop window.
• Recommended Products:
  • Bordeaux Mixture (M1 + M2): Rated ++ (Fair) for bacterial canker.
  • Fixed Copper (M1): Rated ++ (Fair) at labeled rates.
  • REI: 12 to 48 hours, depending on product formulation.

Target Trees: Tart, Sweet, and English Morello Cherries

Cherry Leaf Spot attacks leaves, stems, and fruit. It overwinters in diseased leaves fallen on the orchard floor, discharging sexual spores (ascospores) around bloom before spreading exponentially via rain-splashed conidia.

Key Symptoms & Risks

• Early Signs: Small red-to-purple circular spots (1/8–1/4 inch) on the upper leaf surface, developing whitish, felt-like spore patches on the undersides during wet weather.
• Defoliation Risk: Severe infections turn leaves yellow and cause premature drop. Defoliation before or during late summer starves the tree, leaving buds and wood highly susceptible to winter injury, dead spurs, and limb dieback the following spring. Goal: Trees must retain leaves through September.

Fall & Post-Harvest Management

• Mechanical Sanitation (Fall Action): Rotary mow orchard floors after leaf drop. Flail or rotary mowing hastens the decay of fallen leaves, significantly reducing overwintering inoculum levels for the upcoming spring.
• Fungicide Program: While primary spray programs begin at the bract leaf stage during bloom, two post-harvest fungicide sprays are recommended to protect the green canopy into early autumn and prevent premature defoliation. Captan 80WDG, Indar 2F, Rally, and fixed Copper.

Target Tree: Apple

Apple scab begins attacking leaves and young fruitlets during the primary scab phase in early spring. If infection has taken hold, further infections can occur as secondary scab throughout the entire growing season during wetting events. If you have noticed scab infections in your orchard this season, it is a good idea to consider sanitation practices to reduce inoculum heading into next season.

Fall Management

• Mechanical Sanitation: Rotary mow orchard floors after leaf drop. Flail or rotary mowing hastens the decay of fallen leaves, significantly reducing overwintering inoculum levels for the upcoming spring.
• Urea Foliar / Ground Application: Apply urea at 40 lb/A in 100 gal of water to accelerate leaf litter breakdown:
  • On-tree Application: Can be applied directly to trees via airblast sprayer if leaves are expected to drop within 7 days.
  • Ground Application: Apply to dropped leaves using an herbicide strip sprayer or an airblast sprayer directed toward the ground.
  • Combined Approach: Combining urea applications with post-drop rotary mowing yields the maximum reduction of spring scab inocula.
• Organic & Homeowner Cultural Controls:
  • Mowing & Compost: Raking or mowing leaves and spreading a light layer of compost accelerates natural decomposition.
  • Canopy Pruning: Pruning to open the canopy improves sunlight penetration and air movement, speeding drying times and reducing fungal infection windows.

Target Trees: Apple & Pear

Even if spring fire blight pressure was low, inspecting orchards for overwintering cankers in late fall and winter is critical to prevent bacterial outbreaks next spring.

Symptoms & Biology

• Visual Identification: Look for dead, darkened shoots with dried brown leaves that remain firmly attached to the branches long after normal leaf drop.
• Overwintering Threat: Cankers appear as dark, sunken, or cracking “scorch marks” on the bark. The Erwinia amylovora bacteria overwinter at the margins of these active cankers. In spring, warm rain causes these cankers to ooze bacteria, which insects and rain splash spread to open blossoms.

Management Strategy

Fire blight cankers are easiest to spot in late fall after normal leaf drop, but actual cutouts should be conducted during late winter dormant pruning while the trees and bacteria are inactive.