Asparagus leaf beetle control measures

Asparagus leaf beetle Coleoptera, negative mud worm family, also known as asparagus leaf beetle, thin-necked leaf beetle, mainly distributed in Heilongjiang, Jilin, Liaoning, Inner Mongolia, Beijing, Hebei, Shandong and other places, is one of the common diseases of lettuce cultivation.

<h2 class = "pgc-h-arrow-right" > first, asparagus leaf beetle occurrence law</h2>

1. During the cold winter period, adult insects overwinter under the soil or in the dead stems remaining underground, and will be excavated in the spring of the following year.

2. Spawning in mid-April, spawning period of 3-9 days.

March, April and May is the peak period for adult and larval pests for the first time, the second peak period for larval pests in early July, and the peak period for egg hatching and larval pests in August.

<h2 class="pgc-h-arrow-right" > second, asparagus leaf beetle hazard symptoms</h2>

1, the main harm is my young stems, epidermis, bamboo shoots, first in the nursery field to eat young stems, nibble on the epidermis, and then the adults will be transferred to the field shoot plants to nibble.

2. The larvae nibble on the young stem or epidermis of asparagus, so that the shoot plant is deformed or eaten into a light rod, which will lead to plant death when severe.

<h2 class = "pgc-h-arrow-right" > third, asparagus leaf beetle control measures</h2>

1. Deworming in Qingsun Garden

Before winter or in the following spring, remove the dead branches and leaves in the shoot field in time, and take these dead branches and leaves out of the field for burning or burying to eliminate the overwintering adult insects.

2. Pharmaceutical prevention and treatment

a. At the peak of the emergence of adult insects in the overwintering generation, spray 10% cypermethrin emulsion 2000-3000 times liquid, or 20% cypermethrin emulsion 2000 times liquid, or 5.7% cypermethrin emulsion l500 times liquid, or 24% methoxyfenylhydrazide suspension 2500 times liquid for control.

b. In the peak period of leaf beetle egg hatching, spray the above insecticides on the nursery day to control the leaf beetles at a young age with small resistance and reduce the number of adult insects.

c. Early August is the peak period of leaf beetle egg hatching and larval pests, and it is also a critical period to prevent leaf beetles, but the drug should be stopped 9 days before harvesting.