Common insect pests of Michelia in the mountains and their control
As an evergreen shrub with great ornamental value, Michelia della is widely favored in gardening. However, a variety of insect pests are often encountered during the growth process. This paper systematically combs the characteristics of the three typical insect pests and corresponding ecological control plans to provide scientific management basis for growers. Analysis of three typical insect pests of Michelia deltosa: underground pests: invisible root killers, grub and ground old (H), often lurk in the 10-20cm cultivation layer, causing the plants to suddenly wilting by nibbling on new roots. The damaged plants showed delayed development of new buds, abnormal yellowing and shedding of leaves, and obvious circular bite marks could be seen when searching the roots. Scale insects: Insects such as juice raiders, protected by waxy shells, often attach to the backs of leaves and branches in clusters, and the honey dew they secrete can also induce coal pollution disease. Curly deformed leaves and white flocs on the branches of the invaded plants can be seen. Severe infection can lead to the death of pruned branches. Papilio larvae: Although young leaf devourers have ornamental value, their larvae will continue to gnaw on new leaves, forming irregular holes. During the peak period of insect pests, 50-80 larvae can gather per square meter of leaves, which seriously affects plant photosynthesis. The construction of the ecological prevention system for the comprehensive management plan of Michelia deltosa is recommended to set up facilities such as ladybug towers and Trichogramma breeding boxes around the planting area. The average daily prey of ladybugs can reach 50 aphids. Trichogramma can parasitize eggs of lepidopteran pests. The rate reaches 90%. At the same time, mixed planting of peppermint, rosemary and other insect repellent plants forms a natural barrier. Precision drug prevention and control technology is aimed at underground pests: use 90% trichlorfon 800 times solution for circular ditch application, and cover soil to moisturize after application; use 40% dimethoate emulsifiable concentrate 1500 times solution +0.5% washing powder for scale insect control. Synergist, focusing on spraying cracks in branches and branches; it is recommended to use 50% trichlorfon 1000 times solution and Bacillus thuringiensis preparation alternately for killing papilius larvae.
By building a pest management system that "puts prevention first and precise treatment", it can not only effectively protect the healthy growth of Michelia in the mountains, but also maintain the ecological balance of the park. It is recommended that growers establish a regular inspection system and formulate a prevention and control calendar based on phenological periods to achieve dual improvements in ornamental value and ecological benefits.