What types of pests and diseases occur at the wheat seedling stage
What pests and diseases occur at the wheat seedling stage? Please introduce wheat rust. 15~20 days after wheat emergence, select wheat fields with conditions favorable for disease development for investigation. When the diseased leaf rate reaches 10%, and the autumn temperature is relatively high with more rainfall, immediately spray Heguoli or triadimefon for control, that is, use 12.5% Heguoli wettable powder 1... per mu
What pests and diseases occur at the wheat seedling stage? Please introduce
Wheat rust. 15~20 days after wheat emergence, select wheat fields with conditions favorable for disease development for investigation. When the diseased leaf rate reaches 10%, and the autumn temperature is relatively high with more rainfall, immediately spray Heguoli or triadimefon for control, that is, use 12.5% Heguoli wettable powder 15~20 grams or 15% triadimefon wettable powder 75 grams per mu, mix with 50 kg of water, and spray. When one infected plant is found, protect a patch; when one infected patch is found, protect a block.
Wheat sharp eyespot. Wheat sharp eyespot can occur from the wheat seedling stage to the heading stage. Symptoms at the seedling stage mainly appear on the underground parts. After emergence, it damages the underground stems of wheat, causing brown lesions or elliptical lesions, and develops upward. Use 20% triadimefon wettable powder 75 grams or 20% jinggangmycin 40 grams per mu, mix with 50 kg of water, and spray along the rows. The effect is very good.
Wheat take-all. The pathogen of wheat take-all can infect at the wheat seedling stage, and 20~30 days after emergence is the peak infection period. For plots where wheat take-all has occurred in the past, use 12.5% Heguoli wettable powder 15~20 grams or 20% triadimefon emulsifiable concentrate 120~200 milliliters per mu, mix with 40~50 kg of water, and spray the seedlings along the wheat rows, which can significantly reduce the incidence of the disease at the wheat heading stage.
Wheat aphid. Besides directly causing harm and reducing wheat yield, aphids can also transmit wheat yellow dwarf disease. When the aphid-infested plant rate exceeds 5%, and there are about 10 aphids per 100 plants, chemical control should be carried out. Use 25 milliliters of yashijing or 20 grams of dagongchen or 20 grams of imidacloprid per mu, mix with 40~50 kg of water, and spray along the wheat rows. The effect can reach 98%, and it can also control wheat red spider mites at the same time.
Underground pests. There are mainly three types: mole crickets, white grubs, and wireworms. 30 days after wheat emergence, select representative plots for investigation. When the dead seedling rate reaches 3%, immediately apply pesticide for control. Drill-apply trichlorfon poisoned cakes: use 90% crystalline trichlorfon 75 grams per mu, first dissolve it in warm water, then add water to 1.5 kg to make a medicinal solution, spray and mix it onto 10 kg of crushed and roasted fragrant sesame cakes or rapeseed cakes, and seal for 4~6 hours to make poisoned cakes. Use a drill to apply the poisoned bait into the wheat field. This method can achieve a pest-killing and seedling-protecting effect of up to 95%. Broadcast poisoned soil: use 2% isofenphos-methyl powder 2 kg per mu, mix with 30~40 kg of fine soil, mix evenly, open furrows, and apply into the wheat rows, which can effectively control the damage of white grubs, wireworms, and wheat blossom midges. Spray or irrigate with pesticide water: for plots with scattered patchy damage, use 40% isofenphos-methyl or 50% phoxim 0.5 kg per mu, add 60~75 kg of water, and spray or pour along the wheat rows at the wheat roots. It has a special effect on white grubs and wireworms.
Locusts and crickets. In recent years, these two types of pests have occurred in large numbers and often harm early-sown wheat seedlings. Use 90% crystalline trichlorfon 75 grams per mu, first dissolve it in hot water, then add water to 1.5 kg, spray and mix with 5~7 kg of crushed and roasted fragrant wheat bran to make poisoned bait, and broadcast it along the wheat rows to trap and kill them. The effect is very good.
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