primary pest
The main pests in northwest Fujian are chestnut gall wasp, chestnut elephant, chestnut scissors weevil, chestnut moth, scale insect and so on.
Integrated control measures of main pests in Castanea henryi
Cultivation management measures
Reasonable planting pruning and appropriate sparse planting can inhibit the occurrence of pests and diseases. Pruning branches of pests and diseases in winter, especially in chestnut forest which is seriously damaged by chestnut gall wasps, has obvious control effect, and moderate pruning obviously reduces the population density of scale insects that can overwinter on branches in winter. Deep ploughing in autumn and winter, burying weeds in the soil and wintering places for pests can obviously reduce the harm of pruning elephants, chestnut elephants and chestnut moths.
Protection and utilization of forest natural enemies
Green manure or other leguminous plants can be interplanted in the forest, and seeds of Castanea henryi and Litsea cubeba can also be mixed in the early stage. It is necessary to avoid unnecessary tending and man-made destruction, establish a relatively stable natural enemy population, and at the same time pay attention to the selection of high-efficiency and low-toxicity pesticides, and rationally apply pesticides to reduce the killing of natural enemies. The natural enemies in Castanea henryi forest mainly include the spotted-winged long-tailed wasp, the yellow-bellied long-tailed wasp, the jumping wasp, the mixed-shouldered wasp, the silkworm chasing flies, nematodes, bedbugs and floating insects.
Biological control and chemical control
The application of Beauveria bassiana has a good effect on the control of moths, moths, black-brown bark beetles and chestnut borers. In July and August, Bacillus thuringiensis was used to spray control Spodoptera exigua and Hyphantria cunea, focusing on the middle and lower bracts of chestnut trees, and the control effect was remarkable. In winter, the egg pieces of chestnut aphids are scraped off by hand or painted white with a mixture of sulfur and stones. During the spawning period of adult chestnut pruned striped elephant, the fallen chestnut bags and fruit branches were collected in time every week 1 time and burned centrally, which could eliminate most of the insect sources.
Chemical control
It can be used when pests break out.