Which pesticides work well for controlling pests and diseases on Welsh onions?

The Welsh onion is one of the common allium vegetables, and it is also a very popular vegetable and an important seasoning, with high yields and easy cultivation, and many people grow it. So, what pesticide should be used for Welsh onions?

If Welsh onions have no pests or diseases, there is no need to use pesticides; if pests or diseases occur, pesticides need to be used according to the actual situation. The main diseases of Welsh onions include purple blotch, downy mildew and viral disease, and the main pests include leafminer, onion thrips and beet armyworm, which can be controlled with the corresponding pesticides.

1. Purple blotch: in the early stage of the disease, spray 75% chlorothalonil wettable powder 500-600 times dilution, 70% mancozeb wettable powder 500 times dilution, 64% sandofan wettable powder 500 times dilution and other pesticides, used alternately, spraying once every 7-10 days, for 2-3 consecutive sprays.

2. Downy mildew: in the early stage of the disease, spray 25% metalaxyl wettable powder or 75% chlorothalonil wettable powder 500-600 times dilution, spraying once every 7 days, for 3-4 consecutive sprays.

3. Viral disease: in the early stage of the disease, spray 20% virus A wettable powder 500 times dilution, for 2-3 consecutive sprays.

4. Leafminer: during the peak emergence period of adults, spray 40% dimethoate emulsifiable concentrate 1000 times dilution, 40% omethoate emulsifiable concentrate 1000-2000 times dilution, 50% dichlorvos emulsifiable concentrate 800 times dilution, 50% naled emulsifiable concentrate 1500 times dilution, 40% diazinon emulsifiable concentrate 1000-1500 times dilution and other pesticides, for 2-3 treatments.

5. Onion thrips: during the peak period of nymph damage, spray 10% imidacloprid wettable powder 2500 times dilution, 10% chlorfenapyr emulsifiable concentrate 2000 times dilution, 40% green vegetable treasure emulsifiable concentrate 1500 times dilution, 48% chlorpyrifos emulsifiable concentrate 1300 times dilution, 1.8% abamectin emulsifiable concentrate 3000 times dilution, 17.5% aphid-mite clean wettable powder 2000 times dilution, 40% seven-star protection emulsifiable concentrate 600-800 times dilution, 25% ikar emulsifiable concentrate 1500 times dilution, 50% phoxim emulsifiable concentrate 1500 times dilution and other pesticides, for 2-3 treatments.

6. Beet armyworm: during the peak hatching period of larvae, spray 25% teflubenzuron emulsifiable concentrate 1000-2000 times dilution, beta-cyfluthrin emulsifiable concentrate 1000 times dilution plus 5% flufenoxuron emulsifiable concentrate 500 times mixed liquid, 5% beta-cypermethrin emulsifiable concentrate 1000 times dilution plus 5% flufenoxuron dispersible liquid 500 times mixed liquid.