Pear small heartworms occur 3-4 generations a year, with the habit of turning the main hazard, 1-2 generations damaging peaches and plums, and 3-4 generations damaging peach, plum and apple fruits. The larvae break into the fruit, and under high-humidity conditions, the cockroaches often become black and rot, forming a "dry sputum". Prevention and control of the heartworm should be combined with prevention under the tree and prevention and control on the tree. When the wintering larvae are unearthed, the soil is 6-9 cm under the canopy or the poisonous soil is applied. In the previous year, the rate of insects was above 5% in the orchard. When the rate of fruit was 1% to 2%, spray 10% Uranus 3000 times or 2.5% to kill 3000 times.
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