Control techniques of American white moth

American white moth is a worldwide quarantine pest, also known as American lamp moth, autumn curtain caterpillar, autumn screen moth, etc., which mainly harms fruit trees and ornamental trees, especially broad-leaved trees. it has caused serious harm to garden trees, economic forests and farmland shelterbelts, and has been listed as the first batch of alien invasive species in China. Let's take a look at the control techniques of American white moths.

Morphological characteristics

The American white moth initially lays yellowish green or light green eggs, then turns grayish green, and turns grayish brown before hatching. The mature larvae are 28mm long, black and shiny. The body is yellowish green to gray-black. The adult worm is white, the body length is 13-15 mm, the compound eyes are dark brown, the back of the chest is densely covered with white villi, the male adult antennae are black and pectinate, and the female adult antennae are brown and serrated, and the wings are usually pure white.

Growth habit

The American white moth is now distributed in Liaoning, Hebei, Shandong, Beijing, Tianjin, Shaanxi, Henan, Jilin, Jiangsu, Anhui, Hubei and other places. It can reproduce two generations a year in Liaoning and other places. In recent years, it has been observed that it can reproduce three generations a year in Shandong Province. It overwinters as pupae under the bark or in litter on the ground. The larvae hatch and spin silk to form a net. After the leaves are eaten in the cluster net, the leaves are eaten. The larvae move to another part of the branches and twigs to weave a new net.

Hazard characteristics

The American white moth can harm more than 200 kinds of plants, such as fruits, trees, crops and wild plants. In places with dense orchards, tourist areas and boulevards, when serious occurrence occurs, it can eat up the leaves of the whole tree, resulting in the death of some branches or even the whole plant. It is a serious threat to sericulture, forest and fruit industry and urban greening, causing amazing losses. In addition, the affected trees are weak, vulnerable to other diseases and insect pests, and reduce the ability of cold resistance and stress resistance. the larvae like to eat mulberry leaves, which poses a threat to sericulture.

Prevention and control technology

1. Strengthen quarantine: seedlings in epidemic areas are prohibited from being transported abroad without quarantine or treatment, and prevention and control are carried out actively in the epidemic areas to effectively control the spread of the epidemic.

2. Artificial control: the net curtain was artificially cut off behind the net curtain before the 3rd instar of the larvae, and concentrated treatment. If the larvae have been dispersed, the larvae under the tree pupation will be entrapped by the method of binding grass on the trunk before pupation, and the larvae will be treated with human beings on a regular basis.

3. Trapping and killing adults: using American white moth sex attractants or environment-friendly insect chemotaxis traps to trap adults, put the trap in the trap during the adult occurrence period, and hang the trap in the forest to directly trap and kill male adults, block the mating of pests and reduce the reproduction rate. to achieve the purpose of eliminating pests.

4. Chemical agents: early detection and early control in the period of larval damage. If there is larval harm, check the area under your jurisdiction and control it in time. Biological control is preferred for propylene glycol alginate (algal capping), 1500 times spray of 2.5% cyhalothrin microemulsion, 1500 times spray of Bt emulsion and 1500 times of 2.5% cypermethrin EC can effectively control the pest damage.

5. Biological control: Zhou's rodent wasp is a newly discovered species, which is native to China, but it has become the natural enemy of the American white moth. This wasp can find American white moths that pupate in various concealed places and lay eggs and parasitize American white moths. The achievements of this efficient, economic and pollution-free biological control technology have been identified and are being widely used in epidemic areas.