Hot Pepper Wax helps to repel aphids from your plants, but needs to be frequently re-applied. when Leafhoppers are feeding.
They are not a frequent pest of eggplant, just an occasional one.
See Leaf Hopper Identification and Control.
Dust plants lightly with diatomaceous earth as a deterrent, if they are a chronic problem.
9. Foamy white froth on plant stems. - Spittle Bugs are the culprit. You'll find them beneath the foam. They are not very damaging and I wouldn't recommend using an insecticide for them alone.
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10. Small, irregular to oval-shaped holes along the fruit surface are signs that pepper maggots may be feasting inside. Pepper Maggots are a common pest of Eggplant and related crops.
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To reduce populations, sanitation and crop rotation is helpful. Pick up any fallen peppers and destroy them. Destroy any horse-nettles (an alternate host) in the vicinity.
Neem will help control populations as well.
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11. Knotted plant roots, Galls on roots. Plants wilt readily in dry weather and become stunted.
Root knot nematodes are the likely culprit.
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They are minute translucent worms that inject toxins into plant roots.
There are some resistant varieties - See Eggplant Varieties.
Fish emulsion is believed to help counter nematode toxins, although this has not been scientifically proven. Inter-plant with marigolds. Once infested Predator Nematodes will control the populations of parasitic ones.
12. Seedlings are sheared off at the soil level.
Cutworms are the culprit. They gray to brown nocturnal grubs that feed at night. Handpicking grubs from the soil around plant bases is helpful, however, they hide in the soil by day and are not easily spotted. Keep the garden free of plant debris.
Bt bacillus thuringiensis is a bacterium that is known to kill cutworms, and is readily available to home gardeners.
Leaves droop and roll downward without stunted growth or yellowing.
This is known as Physiological leaf roll, it is not caused by fungus or bacteria or even insects. It is generally a reaction to Climatic conditions. Keep the plants evenly watered. If the issue persists as the weather improves - you may have a nutrient deficiency.
See - Plant Nutrient Deficiencies
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Sunken rot spots, frequently moist and waterlogged lesions. They sometimes blacken and attract fungal/mold growth. Appears on the blossom end of eggplants. It initially occurs as a slight discoloration at the blossom end.
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Blossom End Rot is caused by temporary insufficiency of water and calcium. The soil may have a calcium imbalance inhibiting the uptake of water. Adding limestone can help if the soil if the pH is below 6.0. It may also occur under high temperatures when the eggplants are rapidly growing. Recommended treatment Blossom-End Rot Control
A soft brown rot develops, usually on the sides of fruits touching the ground, or where soil is splashed onto them.
Soil rot, is caused by the a soil-borne fungus and generally occurs during rainy periods.
The spots are sunken, large, and may have a closely-spaced bulls eye pattern . Sometimes the eggplant cracks open. Staking will reduce soil rot by keeping fruit away from the ground.
Sudden wilting and death occurs as the eggplants reach the fruiting stage Often a number of plants in a row or in a roughly circular pattern will show symptoms at the same time.
Phytophthora blight attacks the roots, stems, leaves, and fruit. An unsuspecting grower will first encounter the disease at mid-season.
Avoid water-logged root zones - Grow eggplant in well drained fields. Planting on raised beds will increase soil drainage. Water management is of primary importance for controlling Phytophthora blight. Rotate infested fields with other non-host crops for several years
Agri-Fos and Actinovate are registered for use by home gardeners against Phytophthora blight
A general or blotchy yellowing of the lower leaves and a wilting of youngest shoots in direct sunlight. At first, the wilted shoots may recover over night. The leaf veins turn brown, followed by shoots browning and lower leaf drop. Leaves higher up on the plant turn dull green in color and the edges curl upwards.
Eggplant Plants are stunted and defoliated with only the growing tips remaining green. The fruits are small and may sunscald. The branches tend to be less erect than those of healthy eggplants, giving the plants a prostrate appearance. When the stem is cut open, the water conductive plant tissues may be brownish near the soil line.
Verticillium Wilt is the likely culprit
Sorry to tell you this - but the prognosis, diagnosis and determination is fatal - your plant is gonna die !
Verticillium Wilt canít be cured once it enters the plant. Remove and destroy infected plants. The disease remains in the soil long after you remove the plant
Rotate crops and avoid planting in soil previously planted with related or other susceptible crops.