Lace Wing Bug (Urentius Hystricellus)
It attacks leaves resulting in yellowish patches near the mid rib. It is advisable to collect and destroy the infected plants. It can also be controlled by spraying Dimethoate 30 EC at 1L/ha or Methyl Dementon 25 EC at 1250 ml/ha.
Aphids (Aphis Gossypii)
This pest is a sucking type which is highly active from December to March. The nymphs and adults both damage the plant by sucking cell sap from leaves, stem, bud etc and thus increasing plant mortality rate. It can be controlled by spraying Methyl Demeton 25 EC or Dimethoate 30 EC 500ml or Fenevalerate 20 EC 375 – 500 ml or Thiometon 25 EC.
Diseases and Management
Damping Off (Pythium spp., Phytophthora spp., Rhizoctonia)
It is one of the most common brinjal fungal diseases which infects the seedlings and occurs when it is still in the nursery bed. The seedling become pale in colour and brownish lesions appear at collar region, resulting in wilting and death of seedling. This disease is curbed by treating the seed bed with Formalin before sowing of seeds. The seeds can also be treated with Cerasan or Agrosan G.N at 2 gm/kg of seed before sowing. It can be regularly sprayed with fungicides.The nursery top soil can also be treated with Thiaram at 5g/sq m area of soil. Soil solarisation also effectively controls damping off by spreading 250 gauge polythene sheet over nursery bed before seed sowing and bioagent Trichoderma viride can be applied in soil at 1.2kg/ha.
Phomopsis Blight (Phomopsis vexans)
It is a fungal disease which infects the foliage and fruits. Symptoms are small circular spots later turning brown with irregular blackish margin on the leaves. The stem also show dark brown lesions and spots on the fruit to form rotten areas. It can be prevented by long crop rotation with disease resistant variety. The fruits become soft and watery due to the disease. In order to prevent this disease, the seeds should be dipped in hot water for 50°C for 30 minutes. It can also be controlled by spraying with 0.2% Difolaton or 0.2% Captan in nursery stage. By spraying the field weekly with Zineb (Dithane-Z-78) or Mancozeb (Dithane-M-45) at 2.5gm per litre of water, this disease can be checked.