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The prevention and control of sunflower pods
Sunflower worms are larvae feeding on seeds and sunflower plates, which seriously affect the yield and quality of sunflowers. In the last two years, investigations were conducted on different sunflower field plots, with a low rate of grain worms accounting for 11.2%, a high rate of 40.6%, and an average grainworm feeding rate of 21.4%. In order to increase the yield and quality, sunflower pods must be controlled. Chemical control, in the early stages of larval damage, spraying with 90% trichlorfon or 500% Bataan 500 times, 20% cypermethrin or 2.5% deltamethrin 300 times solution or BT emulsion 300 times spray. Spray 40-50 milliliters of liquid for each faceplate, spraying again once every 5-7 days. At the end of July and early August, when the adult was at the age of 8-9, smoke was sprayed to the field 1-2 times with a sprayer, and 8-15 percent of dichlorvos was used per acre. This method saves labor and water, making it simple and easy. It can also be combined with artificial pollination for pesticide application, using powder puffs (made of cotton and cardboard material to make a flush-sized powdered puff with center-sized bumps) to stick 4-5 g of 5% trichlorfon powder or 2% each time Methyl parathion powder gently rubbed 4-5 disk, 2 kg per mu. Wipe again every 5-7 days. It should be better after the dew has dried every morning. Falling winter irrigation is a good way to eliminate overwintering pests. The first generation of larvae were old and cooked on the sunflower dish, and they sneaked into the deep soil of 15-20 centimeters to overwinter. Implementing the autumn winter irrigation can eliminate most of the winterworms. In addition, the selection of hard-shelled insect-resistant varieties is also a way.