Onion thrips

Leaves with silver-white streaks. Cause Onion thrips. These thrips suck sap... 

If leaf tips are distorted or brown, and leaves are stippled with white, look for onion thrips. Heavy infestations cause plants to wither and turn brown. Adults are tiny, slender, yellow to brown, rapidly moving, winged insects. The larvae can barely be seen with the naked eye. Thrips thrive in hot, dryvjveather. Trap them with sticky traps hung st above plant level. Try blue, yellow, and white traps to see which work best. Treat plants with insecticidal soap or a commercial pyrethrin spray or dust to control severe infestations. 

Predatory mite Amblyseius cucumeris Wesfern flower fhrips, cyclamen mites, onion thrips, spider mites. Apply 100-200 per infested plant to control thrips effect is slow because mites cannot kill adult thrips cold-hardy and will become established in strawberries to control cyclamen mites. Reliable thrips control on greenhouse peppers unreliable on cucumbers. 

Gillespie AT. The potential of entomogenous fungi as control agents for onion thrips, Thrips tabaci. In Day PR, ed. Biotechnology and Crop Improvement and Protection. Thornton Heath, England BCPC Publications, pp 237-244, 1986. 

Leaves with white streaks or blotches. Causes Precipitation damage thrips. Excessive rain or hail can spot onion leaves. Spots are various sizes, and damage doesn t spread. Maintain good air circulation and make sure soil is well-drained to minimize problems. 

Control Spray dormant oil on fruit trees encourage native predators, such as pirate bugs, lacewings, and lady beetles for onion or western flower thrips, release the predatory mite Amhlyseius cucumeris or minute pirate bugs (Oriiis tristicolor) hang blue or yellow sticky traps to catch adults spray insecticidal soap, pyrethrin, or neem as a last resort, dust undersides of leaves with diatomaceous earth. 

Fipronil s high intrinsic activity against Dipterans allows its successful use as a seed treatment in several crops for control of root maggots. In cereals, fipronil provides excellent control of wireworm and wheat bulb fly (Delia coarctata) at rates of 50 g per 100-kg seed [8]. In leeks, seeds filmDelia antiqua) as well as thrips and onion moth [106, 107]. 

The following can affect bulb onions leaf blotch, downy mildew, onion white rot, neck rot, onion fly, cutworms, bean seed fly, thrips and bulb and stem nematode. 

Cutworms, bean seed fly, onion fly, leek moth and thrips can be a problem in the crop. Rust, foot rot, leaf blotch, white tip and white rot are the main disease problems in leeks. 

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