Disease Control : New England Vegetable Management Guide : UMass Amherst

Eggplant - General Eggplant Insect Control Eggplant Weed Control

Anthracnose (Colletotrichum coccodes)

Anthracnose symptoms appear on fruit as small, light brown, irregularly shaped spots. Eventually these spots darken and enlarge, forming large brown patches, often with concentric rings. Start with certified disease-free seed, fungicide-treated seed, or treat seed with hot water to disinfest. Rotate with non-solanaceous crops for at least 3 years to allow infested crop residues to decompose completely. Keep fields free or solanaceous weeds and volunteers.

FRAC Group 3:

azoxystrobin + difenoconazole (Quadris Top): 8 to 14 fl oz/A; PHI 0d, REI 12h, Groups 11 & 3.
flutriafol (Rhyme): 7 fl oz/A; PHI 0d, REI 12h.
tetraconazole (Mettle 125ME): 6 to 8 fl oz/A; PHI 0, REI 12. Do not apply more than twice before alternating to a non-Group 3 fungicide.

FRAC Group 11:

azoxystrobin (Quadris): 6 to 15.5 fl oz/A; PHI 0d, REI 4h. Do not apply more than once before rotating with a non-Group 11 fungicide.
azoxystrobin + difenoconazole (Quadris Top): 8 to 14 fl oz/A; PHI 0d, REI 12h, Groups 11 & 3.
pyraclostrobin (Cabrio EG): 8 to 12 oz/A; PHI 0d, REI 12h. Do not apply more than once before rotating with a non-Group 11 fungicide.
trifloxystrobin (Flint): 3 to 4 oz/A; PHI 3d, REI 12h. Do not apply more than once before rotating with a non-Group 11 fungicide.

FRAC Group 19:

polyoxin D (OSO 5% SC^OG): 6.5 to 13 fl oz/A; PHI 0d, REI 4h. Suppression only.

FRAC Group M01:

copper hydroxide (Kocide 3000): 0.75 to 1.5 lb/A; PHI 0d, REI 48h. Do not apply in a spray solution having a pH less than 6.5 or tank mix with Aliette. An OMRI-listed formulation is available (Kocide 3000-O^OG).

FRAC Group M05:

chlorothalonil (Bravo Weather Stik): 1.5 pt/A; PHI 3d, REI 12h.

Damping-Off

Buy treated seed. Do not use treated seed for food, feed, or oil purposes.

FRAC Group 12:

fludioxonil (Maxim 4FS): 0.08 to 0.16 oz/100 lb seed; REI 12h. For protection against seedborne and soil-borne true fungi. Does not control Pythium or Phytophthora.

FRAC Group M03:

thiram (Thiram SC): 6.5 fl oz/100 lb seed; REI 24h.

Phytophthora Crown and Fruit Rot (Phytophthora capsici)

Phytophthora capsici is a water mold (oomycete) that causes fruit rot, rapid wilting, and death in many types of vegetables. If eggplant is grown in a field infested with P. capsici, plants growing in wetter areas of the field will begin to wilt first. The crown of the plant may also begin to shrivel. Infected fruit can develop soft rotting spots that later spread to consume the entire fruit. In high humidity, the pathogen will produce spores all over the infected fruits that appear fuzzy and gray. P. capsici cannot be managed by fungicide applications alone; successful disease control is achieved only by a season-long effort to manage water and other cultural practices. The single most effective way to control this disease is to prevent its movement into clean fields by equipment, humans, or infested water. Plant susceptible crops (tomatoes, peppers, eggplant, and all cucurbit species) in fields that have no history of this disease and are well-drained. Plant into raised beds, avoid planting in low areas where water puddles, and improve drainage by sub-soiling after heavy rain events. Promptly disk under small areas where the disease appears along with a border of healthy appearing plants. Avoid working in wet fields and compacting the soil.

FRAC Group 4:

mefenoxam (Ridomil Gold SL): 1 pt/A pre-plant or at planting; PHI 7d, REI 48h. For crown rot phase only. Apply as a drench at planting or as a banded application. Must be moved into soil mechanically or by irrigation. Use as a preventative only; will not cure infected plants.

FRAC Group 11:

fenamidone (Reason 500 SC): 5.5 to 8.2 fl oz/A; PHI 14d, REI 12. Do not apply more than once before rotating to a non-Group 11 fungicide.

FRAC Group 29:

fluazinam (Omega 500F): 16 to 24 oz/A; PHI 30d, REI 12. First application can be made as a soil drench at transplanting.

FRAC Group 40:

ametoctradin + dimethomorph (Zampro): 14 fl oz/A; PHI 4d, REI 12h, Groups 45 & 40. Make no more than 3 applications per year or make no more than 2 applications before rotating to a non-Group 40 or 45 fungicide.
dimethomorph (Forum): 6 fl oz/A; PHI 0d, REI 12h, Group 40. Must be applied in a tank-mix with a fungicide with a different mode of action.

FRAC Group 43:

fluopicolide (Presidio): 3 to 4 fl oz/A; PHI 2d, REI 12h. Begin application at time of transplanting for best results. Must be applied in a tank mix-with a fungicide with a different mode of action.

FRAC Group 45:

ametoctradin + dimethomorph (Zampro): 14 fl oz/A; PHI 4d, REI 12h, Groups 45 & 40. Make no more than 3 applications per year or make no more than 2 applications before rotating to a non-Group 40 or 45 fungicide.

FRAC Group P07:

phosphorus acid (Fosphite): 1 to 3 qt/A; PHI 1d, REI 4h. Do not apply to plants that are heat- or moisture-stressed. Best efficacy when tank-mixed with fungicides with a different mode of action.

Verticillium Wilt (Verticillium spp.)

Initial symptoms of Verticillium wilt include yellowing of the lower leaves, wilting, and stunted growth. V-shaped lesions can also begin to form on the foliage. As the disease progresses these lesions will turn brown and become necrotic. Symptoms of wilting typically only occur late in the season or if the infection has become advanced. Infected plants may wilt late in the day and recover in the morning, only to wilt again as the day progresses. Brown-to-black vascular streaking can be observed in the leaves and stems and is characteristic of this disease. Verticillium species can persist in the soil for many years in the absence of susceptible plants. Follow a 4- to 5-year crop rotation with non-solanaceous crops to reduce inoculum levels in fields. Include grain crops in the rotation. Readily control weeds as many are susceptible to Verticillium. Remove and destroy infected plant material after harvest. Resistance to Verticillium species in pepper and eggplant is poor. Fumigate in fall with Vapam as directed on the label. Mulching plants with black plastic may reduce disease severity. See Soil Fumigation Outdoors in the Disease Management Section for more information.

FRAC Group BM02:

Streptomyces lydicus WYEC 108 (Actinovate AG^OG): 3 to 12 oz/A; PHI 0d, REI 4h. Soil-applied.
Bacillus amyloliquefaciens strain D747 (Double Nickel 55^OG): 0.125 to 1 lb/A (soil), 0.25 to 3 lb/A (foliar); PHI 0d, REI 4h.
Bacillus subtilis strain IAB/BS03 (Aviv^OG): 10 to 30 fl oz/A; PHI 4d, REI 4h.

FRAC Group NC:

sodium methyldithiocarbamate (Vapam HL*): 37.5 to 75 gal/A; PHI n/a, REI n/a (see label for entry restricted periods). *Restricted-use pesticide. Product is applied post-harvest and 14-21 days before a new crop is planted..

FRAC Group P04:

ametoctradin + dimethomorph (Vacciplant): 0.15% v/v solution (19.2fl oz/100 gal water); PHI 0d, REI 4h. Apply as pre-plant dip and soil drench immediately prior to transplanting.