How to use pesticides for vegetable diseases and pests? Keep this updated guide table handy
Disease name Common compounds Remarks Downy mildew Mancozeb, zineb, pyraclostrobin + dimethomorph, cymoxanil, cyazofamid Drench the roots at the early stage of disease; ...
Disease
| Name | Common compounds | Remarks |
| Downy mildew | Mancozeb, zineb, pyraclostrobin+dimethomorph, cymoxanil, cyazofamid | Drench the roots at the early stage of disease; pay attention to spraying before and after rain; promptly dispose of and destroy diseased plants and leaves |
| Fusarium wilt | Azoxystrobin, prochloraz, hymexazol, difenoconazole | At the early stage of disease, spray the stem base or drench the roots; for severely diseased plants, pull them out and destroy them directly, and disinfect the soil (Note: difenoconazole and thiophanate-methyl at too high a concentration can easily cause phytotoxicity) |
| Gray mold | Boscalid, pyrimethanil, ethylicin, procymidone, iprodione, prochloraz, fludioxonil | Apply pesticide at the early stage of disease |
| Bacterial wilt | Zhongshengmycin, thiodiazole-copper, zinc thiazole, chlorobromoisocyanuric acid | At the early stage of disease, drench the roots; for severely diseased plants, pull them out and destroy them directly, and disinfect the soil |
| Anthracnose | Azoxystrobin, dihydroanthraquinone+Difenoconazole, prochloraz | Apply pesticide at the early stage of disease; pay attention to spraying before and after rain |
| Powdery mildew | Azoxystrobin, kresoxim-methyl, chlorothalonil, trifloxystrobin, fluopyram+Ethirimol, difenoconazole, myclobutanil | Apply pesticide at the early stage of disease; pay attention to spraying before and after rain |
| Phytophthora blight | Zineb, mancozeb, pyraclostrobin + dimethomorph, cyazofamid, cymoxanil | Drench the roots at the early stage of disease; pay attention to spraying before and after rain; promptly dispose of and destroy diseased plants and leaves |
| Root-knot nematode disease | Abamectin, fosthiazate, carbosulfan | Abamectin for root drenching; the others for soil mixing and furrow application |
| Viral disease | Moroxydine hydrochloride, oligosaccharins - chain protein, amino-oligosaccharin | Apply pesticide at the early stage of disease; mainly for prevention |
| Soft rot and black rot | Copper hydroxide, thiodiazole-copper, zinc thiazole, zhongshengmycin; or zinc thiazole+Copper abietate | At the early stage of disease, spray the plants and the ground |
| Rust | Bromothalonil, trifloxystrobin, azoxystrobin, triadimefon | Apply pesticide at the early stage of disease; pay attention to spraying before and after rain; promptly dispose of and destroy diseased plants, leaves, and fruits |
| Bacterial angular leaf spot | Copper hydroxide, copper abietate, thiodiazole-copper, zinc thiazole, zhongshengmycin | Apply pesticide at the early stage of disease; pay attention to spraying before and after rain; promptly dispose of and destroy diseased plants, leaves, and fruits (Note: it is recommended to use copper hydroxide alone!) |
| Sclerotinia rot | Prochloraz, procymidone, iprodione, tebuconazole, boscalid | At the early stage of disease, drench the roots; for severely diseased plants, pull them out and destroy them directly, and disinfect the soil |
| Damping-off and seedling blight | Hymexazol, mancozeb, thiophanate-methyl; or procymidone+Chlorothalonil, pyraclostrobin+Mancozeb | At the early stage of disease, drench the roots; for severely diseased plants, pull them out and destroy them directly, and disinfect the soil |
| Root rot | Hymexazol, mandipropamid , fluazinam | At the early stage of disease, drench the roots; for severely diseased plants, pull them out and destroy them directly, and disinfect the soil |
Pests
| Name | Common compounds | Remarks |
| Lepidopteran pests(diamondback moth, cabbage caterpillar, beet armyworm, tobacco cutworm, cucumber moth borer, bean pod borer, etc.) | Emamectin benzoate, indoxacarb, spinetoram, chlorantraniliprole, metaflumizone, chlorfenapyr, diflubenzuron, diafenthiuron | Apply pesticide when larvae are young; diafenthiuron can control older larvae (Note: the pre-harvest interval for chlorfenapyr is 14 days) |
| Whitefly(greenhouse whitefly, tobacco whitefly) | Spirotetramat, sulfoxaflor, buprofezin, thiamethoxam, clothianidin, imidacloprid | Apply pesticide as soon as the pest first appears; spray in the morning when the dew has not yet dried |
| Flea beetle | Lambda-cyhalothrin, acetamiprid, pyridaben | While spraying the pesticide onto the vegetables, also pay attention to spraying an appropriate amount of pesticide into the soil; hang yellow sticky boards in the field as well |
| Thrips(yellow thrips, flower thrips) | Imidacloprid, acetamiprid, nitenpyram, thiamethoxam and other neonicotinoid insecticides; sulfoxaflor, spirotetramat, spinetoram, abamectin, lambda-cyhalothrin | To deal with thrips on flowers, spray when the flowers open in the morning; to deal with thrips on leaves; also pay attention to spraying an appropriate amount of pesticide into the soil; hang blue sticky boards in the field as well |
| Melon fly(needle bee) | Abamectin, deltamethrin, lambda-cyhalothrin | Apply pesticide from 8-10 am and 4-7 pm; strengthen spraying in shaded melon fields; hang yellow sticky boards, sex pheromone lures, and sticky trap bottles in the field as well |
| Leafminer(squiggly lines) | Cyromazine, chlorfluazuron, emamectin benzoate, abamectin + lambda-cyhalothrin | Apply pesticide when a small number of larval tunnels appear |
| Aphid(melon aphid, cotton aphid, cabbage aphid, etc.) | Pymetrozine, imidacloprid, acetamiprid | Apply pesticide when aphids are few (Note: melons and beans are sensitive to imidacloprid and are prone to phytotoxicity!) |
| Aulacophora beetle | Lambda-cyhalothrin and other pyrethroids; acetamiprid, imidacloprid | Apply pesticide when larvae are young |
| Spider mite | Spirodiclofen, pyridaben, etoxazole, cyenopyrafen, bifenazate, etc. | Apply pesticide when the pest first appears |
| Underground pests(white grubs, black cutworm, chive maggot, garlic maggot, mole cricket, etc.) | Beta-cypermethrin, chlorpyrifos, phoxim, carbosulfan, etc. | Drench the roots |
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