First, the harmful symptoms of pepper jumping nails
Pepper jumping beetle belongs to the order Coleoptera and the family Pterodactycephalus. In our province, there are four kinds of jumping armor that harm peppercorns: copper-colored peppercorn jumping nails, red shin peppercorn jumping nails, blue orange diving jumping nails and orange jumping nails. The adults of these species are small, with elytra wings of bronze, blue or orange, and all have a metallic luster.
These kinds of adult beetles mainly feed on the young leaves or petioles of peppercorns, generally eating from the leaf margin first, resulting in a lack of leaf carving, and some eat from the middle of the leaves, so that the leaves form holes. After hatching, most of the larvae burrow into the leaves to eat the leaf flesh, leaving only the epidermis, and looking at the pepper tree in the distance, it is scorched, causing the pepper tree to sprout twice, exhausting nutrients, resulting in reduced production or even harvest failure. After hatching, some of the larvae directly moth into the peduncle or petiole to harm the tender pulp, causing the compound leaves and inflorescence to wilt and droop, and then turn black and wither, and fall to the ground in the wind. Some of the larvae also infest the young pepper fruit of the moth, causing the fruit to become empty and fall off early. Larval borer holes are often produced in a yellow-white translucent gelatinous pattern. The larvae can be transferred to the pest many times, and when mature, they fall to the ground and dive into the soil to pupate. Adults overwinter in a soil layer of 5 to 10 cm under the canopy of the pepper tree.
Second, prevention and control methods
1. Agricultural control. In mid-May, check the pepper garden at any time, and find that the wilted inflorescence and compound leaves should be cut off in time, burned or buried deeply; in the first half of June, the pepper garden should be cultivated to eliminate pupae; after the pepper harvest, the dead branches, fallen leaves and weeds under the tree should be completely removed, and the old bark and warped skin of the pepper tree should be scraped off, and the overwintering adult insects should be burned in a concentrated manner to eliminate the overwintering adult insects.
2. Soil medication. According to the habit of adult insects overwintering in the soil, before the adult insects emerge from the peak period, the soil under the canopy is shaved loosely, 0.6 kg per mu with 50% octyl thiophosphorus emulsion or 48% Lesben emulsion, 30 kg of water is evenly sprayed on the ground within 1 to 1.5 meters around the tree, and then cross-rake twice, so that the agent is evenly mixed into the soil, which can effectively prevent the emergence of overwintering adult insects.
3. Spray medicine on trees. In early May, 90% crystalline dichlorvos 1000 times liquid, or 80% dichlorvos emulsion 2000 times liquid, or 48% Lesben 1000 times liquid, or 4.5% high-efficiency cypermethrin 2000 times liquid can be sprayed to eliminate adult worms. (Provincial "12316 Sannong" plant disease and pest expert Meng Tienan)