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Disease management

Onion diseases have always been an important factor for the loss. To combat these we need to identify the symptoms, understand the exact cause beneath and endeavour effective measures to irradicate the pathogen at the earliest as possible

Pest managemntIt is important that onion Pest be recognized early in their development so that effective management strategies can be implemented. Thrips are the most important insect pests on onions. Adults are yellowish to yellowish brown with narrow wings

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Onion thrips

Symptoms : Thrips are the most important insect pests on onions. Adults are yellowish to yellowish brown with narrow wings. Eggs are laid in clusters in leaf tissues.Numerous nymphs and adults are observed etween leaf sheaths and stems lacerating the epidermis of leaves and sucking the exuding cell sap. The affected leaves show silvery blotches which later turn into brownish colour. The leaves get distorted from tips downwards and plant ultimately wilt and dry away. Seedlings are killed due to heavy infestation and the plant growth is retarded. The shape and size of bulbs as well as yield is affected by thrips.

Control:

Apply neemc ake 250 kg/ha at 20-30 DAP
Spray NSPE 4% or neem soap 1% or acepate ( 1 g/l) or pipronil ( 1 ml/l) or lamda cyahlothrin ( 1 ml/l).
Regular irrigation also helps in minimizing losses due to thrips.
Collection and destruction of egg masses and gregarious caterpillar of the cut worm is the best method. For this regular scouting has to be done for the egg clumps and gregarious damage symptoms For controlling the grown up caterpillars, baiting with jaggery mixed rice bran has to be done.
More Pests Thrips Head Borer Maggot Nematode Cut-worms

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