The latest control methods of litchi bug

Litchi bug is a fruit tree pest, also known as litchi bug, for Hemiptera litchi bug insects, mainly harm litchi and longan, but also harm other Sapindaceae plants, adult body length about 25 mm, body shield shape, yellow brown, China distributed in Fujian, Taiwan, Guangdong, Guangxi, Yunnan and other provinces, let's take a look at the control methods of litchi bug!

morphological characteristics

Litchi bug adult body length of about 25 mm, body shield shape, yellow brown, ventral white wax powder, there are smelly glands, opening in the chest ventral junction after the chest. Ovoid, 2.5 - 2.7 mm long, pale green, turning dark gray before melting. The nymph is red and black. The eggs are nearly spherical, 2.5 - 2.7 mm in diameter, pale green at first birth, a few pale yellow, purple near hatching, often 14 particles gathered into a block.

living habits

Litchi bugs have one generation a year and overwinter as adults in dense leaf clusters or on the back of old leaves on trees. In March and April of the following year, they resume their activities and lay eggs on the back of leaves. The nymph is most harmful in May and June. The nymph has 5 instars and lasts about 2 months. It has the habit of pseudo-death. Most of them emerge into adults in July and enter the overwintering period after cold weather. The nymph and adult prick the sap of young shoots, flower spikes and young fruits of litchi and longan, resulting in flower and fruit drop. In case of disturbance, often emit smelly liquid self-defense, touch and tender shoots, young fruit local will zoom brown.

damage symptoms

Both adults and nymph of litchi bug prick and suck the juice of tender shoots, flower ears and young fruits, resulting in flower and fruit drop. The smelly liquid secreted by it touches the stamens, tender leaves and young fruits, etc., which can cause the contact parts to die, seriously affect the yield when it occurs, or even no harvest.

control methods

1. Agricultural control: Agricultural control is mainly artificial capture. During the low temperature period in winter (below 10℃), litchi bugs are frozen and difficult to take off. Suddenly, the branches are shaken violently to make the overwintering adults fall to the ground and burn them intensively. The flat-bellied wasp is used to control litchi bugs.

2. Chemical control: spray trichlorfon solution (800~1000 times) to eliminate overwintering adults before they lay eggs in early spring. Spraying the second time at the nymph stage eliminated a large number of third-instar nymph. Comprehensive spraying in areas with high insect population density, focusing on spraying in areas with low insect population density and few flowering fruit trees. Large areas of litchi contiguous areas, with aircraft control.