In order to accurately monitor the development trend of pine caterpillars, in recent days, the Forestry Bureau of Qiyuan has closely monitored the natural enemies at the ovoid stage of pine caterpillars, and found that the parasitism rate of natural enemies in the ovary stage of pine caterpillars has reached more than 85%.
It is understood that the natural enemies of the pine caterpillar egg stage distributed in the Qiyuan forest area mainly include small insects such as black egg bees, red-eyed bees, and Ji xiao wasps. Although they are small, they are experts in combating the enemy, mainly by parasitic means to inhibit the hatching of pine caterpillar larvae.
At the beginning of August, the technicians of the forest defense station collected 130 pine caterpillar egg blocks in the pine forest near the site, and indoor observations showed that the parasitism rate of natural enemies in the ovoid stage of pine caterpillars was 97.69%. At the end of August, they conducted a survey of the hatching rate of pine caterpillar eggs and egg mass larvae in the high incidence area of Pine Caterpillar in the 07 ditch of the Suge River, and the results showed that the parasitism rate of natural enemies in the ovary stage of Pine Caterpillar reached 88.89%.
In order to ensure the healthy growth of trees in the ecological function area, the Bureau adopted pollution-free aircraft control measures in early June, effectively controlling the damage of pine caterpillar larvae to the pine forest. In July, when the lamp temptation survey was taken on the peak period of the feathering of pine caterpillar adults, it was found that the number of pine caterpillars in local areas such as Suge River 07 Ditch reached more than 10,000 heads per night, and pine caterpillars under the lights in front of the windows in residential areas were also everywhere, showing a strong outbreak trend. In order to effectively reduce the hatching rate of pine caterpillar eggs, the forest defense station introduced the red-eyed bee card of large moth eggs that can control 4,000 acres of pine forest in early August, increased the number of natural enemies at the egg stage of pine caterpillars, and controlled the hatching rate of pine caterpillar eggs. (Correspondent Lei Ying)