Longtou News (reporter Li Dan) From the beginning of April to November every year, aphids, elm green hair firefly leaf beetles, elm purple leaf beetles and other stinging insects, leaf eating insects encroach on the leaves, causing the leaves to shrink and curl, wither and yellow, and green, which seriously affects the garden landscape and the normal growth of plants. At present, the main pharmaceutical control method used in Harbin City kills some beneficial insects while eliminating insects. In order to avoid pollution caused by chemical agents and protect the ecological environment more effectively, biological control will be an environmental protection prevention and control method advocated by the garden industry.
The researchers of the Harbin Landscaping Research Institute consulted the relevant materials, adopted the biological control method of "treating insects with insects", and used the natural enemies of aphids, elm green hair firefly and elm purple leaf beetles - ladybirds to control pests.
On the basis of fully understanding the biological characteristics of heterochromatic ladybirds and turtle ladybirds, ladybirds were captured outdoors for artificial breeding in early 2019. At the same time, the branches infected by the larvae of aphids, elm green hairy leaf beetles and elm purple leaf beetles in the wingless stage are collected and artificially raised. At the end of April, more than 50 ladybugs were caught in a large container, and researchers at the Harbin Municipal Institute of Landscape Architecture found that ladybugs were interested in the larvae of leaf beetles and aphids, and they were fierce in feeding.
Every day, researchers collect insect-infested leaves from the park, and a leaf full of hundreds of aphid larvae is put into the feeding bottle, and a pair of ladybugs can eat the aphids on the leaves in two days. Ladybugs eat a lot of food, excrete frequently, in less than 3 days the feeding bottle is full of "black spots", although ladybugs are very unhygienic, they will find a clean place to lay eggs. To this end, the staff cleans the feeding bottles every two days and takes the eggs laid by the ladybirds out of their own to reproduce.
After 2 months of observation, more than 50 ladybugs have completed their first generation of reproduction, and a pair of breeding has spawned five times. In order to further observe the rearing of ladybirds, researchers put a large number of propagated ladybirds into the greenhouse for experiments, and after a period of observation, the stinging insects in the greenhouse were effectively controlled.
So far, the observation of the biological characteristics of ladybirds has achieved phased results, which proves that heterochromatic and tortoiseshell ladybirds have a very effective prevention and control effect on the control of stinging insect pests and eggs of some insect pests.
In the next step, harbin landscaping research institute will continue to study the feeding, mass reproduction and release technology of ladybirds, and apply the research results to the prevention and control of diseases and insect pests in Harbin, carry out the application and promotion of biological control technology for garden diseases and insect pests in Harbin, and make new contributions to the protection of the ecological environment of Harbin.