Methods for controlling the grasshopper scale insect
Are you curious about introductions to floral clinics, the methods for controlling the grasshopper scale insect? Next, the editor will introduce these to everyone.
Host plants and damage
Paulownia, planetree, poplar, willow, pagoda tree, catalpa, hackberry, camphor tree, maple, ligustrum, magnolia, Dalbergia, chestnut, walnut, persimmon, jujube, pear, peach, apple, loquat, citrus, lychee, etc. The nymphs absorb the sap from tender branches and buds, causing slow growth of the new shoots in spring. After fruit trees are damaged, the quality of the fruit is affected. The damage is significant, and whether it is ornamental plants or economic crops, their growth rate will be greatly reduced once they are affected.
Occurrence pattern
It occurs once a year. The eggs overheat and overwinter in the upper part of the soil. From late January to early February of the following year, they start to hatch in the soil, which can resist low temperatures. They can also hatch under the snow during the "Great Cold" period, but the nymphs are slow-moving and stay underground for several days. With higher temperatures, the stay is shorter, and on sunny and warm days, the number of individuals emerging from the ground increases significantly.
The hatching period lasts for more than a month. After hatching, the nymphs climb up the stems to the tips, the axils of the buds, or the newly expanded leaves to absorb nutrients. Male nymphs pupate in late April and transform into adult males in early May. The emergence period is relatively uniform, about a week, after which they immediately look for mates to mate, with a lifespan of 2 to 3 days.
Female nymphs molt three times and then become adult females. They continue to crawl down from the top of the stems, mate, and then burrow into the soil to lay eggs. The eggs are wrapped in white wax threads, forming an egg sac with more than 100 eggs in each. When the population density of grasshopper scale insect nymphs and adults is high, they often migrate in groups, covering nearby walls and ground, which is disgusting.
Control methods
1. In early spring, before the nymphs emerge from the soil and climb the trees, remove the old bark and wrap a 10 cm wide adhesive tape around the tree, and apply a 30 cm wide sticky insect glue ring to trap the nymphs climbing up. The sticky insect glue can be made by boiling 0.5 kg of waste engine oil, cottonseed oil, or diesel oil thoroughly and then adding 0.5 kg of crushed rosin. After melting, remove from heat and use. It can also be applied directly by melting cottonseed mud or asphalt. Alternatively, tie a plastic adhesive tape higher than 10 cm in height around the base of the tree or apply a fatty oil containing pyrethroids to kill the nymphs climbing up.
2. Spraying pesticides such as scale insect killer, scale insect death light, and dichlorvos 1000-fold liquid can control the nymphs climbing the trees.
3. Dig a pit under the tree in mid-April, place leaves inside to attract female adults to lay eggs in the pit and then destroy them.
4. Protect natural enemies, the main natural enemies of the grasshopper scale insect include red-edged lady beetles and large red lady beetles.
5. During the pupation period of male insects and the egg-laying period of female insects, clear the insect bodies from nearby walls.
The above is the complete content on the control methods for the grasshopper scale insect, which green plant enthusiasts can refer to.