Leafhopper pests are small insects, and their adults and nymphs use piercing-sucking mouthparts to suck the juice inside kiwi leaves and branches to maintain their growth, development, reproduction and life activities. As a result, the nutritional components of the tree are lost, and pale spots appear on the damaged parts of the leaves and tender stems and branches. In severe cases, the entire leaves turn yellowish white to pale, causing early leaf fall, affecting tree vigor, and seriously affecting the photosynthetic function of leaves.
The green leafhopper is widely distributed in the north and south of the Yangtze River in my country, and is the most common omnivorous kiwifruit pest. Adults are light green, with a body length of 2.1-2.8 mm. The head protrudes forward, and the crest is light yellow-green, especially the back part of the frontal lip is yellower. Egg white, oblong, about 0.6mm long. The body length of the nymphs is about 0.7 mm when they first hatch, and then gradually increases in size, and the color gradually turns green, and the compound eyes turn from red to brown. There are several generations in one year, overwintering as adults on kiwifruit trees, intercrops and weeds. In March of the following year, it began to cause damage, sucking the juice of young leaves with its piercing-sucking mouthparts, and mostly concentrated on the back of the leaves. The thinner the leaves, the more severe the damage. The damaged leaves show white dense small needle-like holes, and in severe cases, the leaves will fall early.
Prevention methods:
① Choose thick-leaved varieties, such as 'Jinkui' with thick leaves (0.7mm), and rarely suffer from whitening and early leaf fall, while 'Lushanxiang' with large and thin leaves suffers more;
② Try not to spray poison, protect natural enemies and maintain ecological balance.
