Iris is a kind of plant with strong resistance to insects, and generally it will not be damaged by insects. But there is a kind of insect, commonly known as the little tiger, that can harm the iris.
In fact, the pests of small tigers are quite common in Hengshui. Small tigers can produce three generations a year, so they breed a lot and quickly.
The small larva of the ground tiger will gnaw the leaves of the iris into holes and defects, while the larger larva will lurk in the soil of the roots in the daytime, and will gnaw and cut off the roots of the ground in the evening, thus affecting the growth of the iris, and will make the leaves of the plants dry, yellow, or even fall.
The small land tiger's insect damage can't be underestimated, so how to effectively control it?
First of all, it can be controlled by drugs.
In the larva 3 years ago to control, at that time the effect is the best
You can use 5% phoxim granules and fine soil, mix them well, and then sprinkle them on the lawn; or spray 50% phoxim solution 1000 times. In this way, the larva can be killed directly, not allowed to reproduce.
Second, it can be bio controlled.
Biological control can be used, black light lamp or sweet and sour liquid to trap and kill mature insects.
Set up the black light and the sweet and sour liquid between the beginning of March and the end of May. First put a large cylinder with water under the light, and then sprinkle the oil on the water surface. In the configuration of sugar and vinegar
Configuration of sugar and vinegar solution: 1 part for brown sugar, 3 parts for vinegar, 10 parts for water, and a small amount of trichlorfon solution, then stir evenly.
When you use it, you should choose a sunny evening, put the solution in the middle of the iris seedlings, and then it can be recovered after daybreak. When you collect the insects that have been killed, and then bury them or throw them into the garbage can, you can
