Pathogens: adults: body length 8-9mm, width 2.5mm. Slim and flat, yellow hair. The head and chest are dark brown, with elytra wings, tentacles and feet reddish brown. The tentacles are short, the first section is the longest, the second section is longer than the third quarter, the base end is slightly thicker, it is slightly serrated from the fourth quarter, the thin end of each node is wide, and each is about the same length. Conical. The anterior thoracodorsal length is slightly larger than the width, the posterior angle is sharp, and the top is somewhat upturned; the eel wing is long and narrow, the tip is pointed, and each row has 9 rows of deep seal points. Eggs: milky white, nearly round. Larvae: light yellow, bright. The mature larvae are about 32mm long and about 1.5mm wide. Flat head, mouthparts dark brown. The first thoracic zone is slightly shorter than the second and third quarters. 1-8 abdomen is roughly equal in length with a conical K-tail. There are 1 round brown spot and 4 brown vertical lines on both sides of the base. The top has 1 round protrusion. Carcass length 8-9mm, light yellow. Incidence of the law: Chestworm is about 3 years to complete one generation in the Northeast. The Hetao Plain in Inner Mongolia was seen in June. The earthworms were mostly in the 7-10cm deep soil layer. In the middle and late June, the adult eclosion became adult, and the adult motility was strong. From late June to early July, spawning period is high and eggs are produced in the topsoil. In Keshan, Heilongjiang, the egg period is 8-21 days. Larvae require high soil moisture; strong resistance to low temperatures. When the average temperature in Hebei was 0°C in April, it began to rise to the top soil layer. Generally 10cm deep soil temperature 7-13 °C when serious harm. Heilongjiang in late May 10cm deep soil temperature reached 7.8-12.9 °C at the time of damage, soil temperature rises to 17 °C in July, the gradual stop harm. Control methods: (1) When sowing, sprinkle 5% phoxim granules 1 to 5 grams on the seedbed, mix 30 times with fine soil and pour into the soil to kill the larvae effectively. (2) If a seedling is unearthed or planted, if it is found to be harmful to the genus Chestworm, the above medicine can be applied one by one and buried in the topsoil adjacent to the seedling plant with cerium, and a certain effect can also be obtained. (3) The nursery is intensively cultivated so that birds can be eaten by mechanical damage or by turning the body out of the soil surface to reduce the density of the slim-broached adult. Plowing in summer and freezing in winter after cultivating can also eliminate some insect galls. (4) Strengthen nursery management, avoid immature grasses, etc., to induce adult reproduction. (5) In the spring and autumn when the adult activity is most prosperous, use 50% trichlorfon 500 g mixed soil 25 to 30 kg to spread on the soil surface or into the soil surface. Barrier Mesh,Plastic Fence Mesh,Insect Barrier Netting,Agfabric Insect Netting Changzhou Satidi Import and Export Co., Ltd. , https://www.guanjiejts.com
Identification and control methods of broccoli worms in day lily