Withered Leaf phenomenon and Disease Control of Wheat

15-20 days after the emergence of wheat rust, wheat fields with disease conditions were selected for investigation. When the rate of diseased leaves reached 10%, and the temperature was too high in autumn and Rain Water was on the high side, the wheat rust was immediately sprayed with triadimefon or triadimefon, that is, 12.5% WP 1520 g or 15% Triadimefon WP 75 g per mu was used to spray 50 kg of water. One piece at a time. Wheat sheath blight can occur from seedling stage to heading stage. The symptoms of the seedling stage are mainly manifested in the underground part, which harms the underground stem of wheat after emergence, showing brown spots, or oval spots, and developing upward. 75 grams of 20% vermicellin wettable powder or 40 grams of 20% Jinggangmycin per mu is sprayed on 50 kg of water along the ridge, the effect is very good. The pathogen of wheat take-all disease could be infected in the wheat seedling stage, and the infection peak was 20-30 days after emergence. For the plots where total erosion disease of wheat has occurred in the past, spraying seedlings with 12.5% WP 15g / mu or 20% EC 120g / mu to 40kg / mu to 40kg / mu can significantly reduce the incidence of wheat at spike stage. Wheat aphid can not only directly damage the yield of wheat, but also spread wheat yellow dwarf disease. When the rate of aphids is more than 5% and the number of aphids per hundred plants is about 10, chemical control should be carried out. With 25ml aphid lice net per mu or 20 grams of imidacloprid or 20 grams of imidacloprid to 40-50 kilograms of water, spray along the ridge, the effect is very good, and can also control wheat red spiders. The main underground pests harming wheat at seedling stage are mole cricket, grub and golden needle worm. It is observed that when the mole cricket is harmful, the tender stem of the wheat seedling will be bitten into a random hemp shape, and the fracture surface is irregular; when the grub is harmful, the root and stem of the wheat seedling will be broken off and the fracture surface is neat; the golden needle worm drills into the tender heart of the wheat stem, and the injured part is hemp-like, but the outer skin is still linked together. Careful observation of these damage conditions of wheat seedlings, without digging investigation, can determine which kind of underground pest appeared in the wheat field. Representative plots were selected for investigation 30 days after wheat emergence, and pesticide control was carried out immediately when the seedling death rate reached 3%. Wear trichlorfon poison cake: use 90% crystal trichlorfon 75 grams per mu, first melt it with warm water, then add water to 1.5 kg to form a medicine solution, spray and mix on 10 kg of crushed sesame cake or rapeseed cake, and stuffy for 4 hours for 6 hours, then become poison cake. Put the poison bait on the wheat field with bait. The effect of killing insects and protecting seedlings by this method can reach 95%. Spread poisonous soil: use 2% methyl isophosphates powder 2 kg per mu to mix fine soil 30 kg 40 kg, mix well and then ditch it into the wheat ridge, which can effectively prevent the harm of grubs and golden needles. Sprinkler irrigation potion: for plots where spot damage occurs, 40% methyl isophos or 50% phoxim 0.5 kg per mu can be used for 60 kg / mu of water, spraying wheat roots along ridges, which has a special effect on grubs and golden needle worms. Locusts and crickets occur in large quantities in recent years, which often harm early-sown wheat seedlings. Can use 75 grams of 90% crystal trichlorfon per mu, first with hot hydration and then add water to 1.5 kg, spray and mix 5-7 kg of wheat bran that has been crushed and fried, mix it into poison bait, spread traps along the ridge, and the effect is very good.