(1) Red spider. The individuals are extremely small, usually about 0.3 mm in length, and are difficult to see with the naked eye. Observing them requires a magnifying glass. The body is red and often gathers on the backside of the leaves. It mainly sucks the juice of the plants and causes the leaves to have gray spots. In severe cases, the leaves turn yellow and fall off, the growth of new shoots is poor, and the tree vigor is weakened. Red spiders occur 10 generations a year, and the damage is particularly severe during high temperatures and droughts in June-August, but heavy rain and rainy weather are less harmful. Litter should be removed in winter to eliminate overwintering adults 1000 times more often than 10% Uranus EC 1000x, 7051 chrysanthemum 3000 mg or pyridazinone Liquid spray to kill.
(2) Pear nets, also known as military distribution insects. Pear nets adults gray, winged, flat body. The clusters often suck sap from the back of the leaves, turning the leaves into yellowish-brown and even white. The yellow-brown rust-like spots formed by the secretions on the back of the leaves cause early defoliation after the damage, affecting growth and viewing. Peargrass is a hazard period from May to October, and it occurs more during the summer and autumn, especially when the weather is dry in August. Clear the fallen leaves and reduce the number of overwintering insects. When the first generation larvae occur in mid-May, they can spray 40% omethoate EC 1500 times or insecticide 2000 times.
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