Spring rape to prevent leaf miners

L. minuticae occurs in all regions of rapeseed production in China, damaging leaves and other organs, affecting photosynthesis and reducing rapeseed yield.
Occurrence The adults of the leaf miner are active during the daytime on sunny days, sucking nectar or leaf juice and spawning eggs. The most common hazards occurred from late March to late May. The nectar of rape was abundant during the flowering period, and the fecundity of adult larvae was increased. The number of larvae at the node stage increased sharply, and the number and damage degree of the larvae at the end of pod enlargement reached the highest peak. Good growth, dense dark green fields are heavy, and cabbage varieties are heavy. Leafminers are hardy but not heat tolerant, and high temperature and drought are not conducive to their occurrence.
Field diagnosis of rapeseed flowering in the horny stage, the larvae infiltrate the upper and lower epidermis of the leaves and feed on the leaves. On the leaves, gray and white curved and irregular insect tracts are formed with fine insects. When the damage is severe, the leaves are covered with insects and the tissue loses green color, which seriously affects photosynthesis. Larvae also eat tender stems, pedicels, and tender pods.
Prevention and control techniques Spraying prevention and treatment of spring adult emergence or larval incubating period can be achieved with 48% chlorpyrifos EC 2000 times, or 0.9% avermectin EC 2000 times, or 5% chlorfluazuron EC 2000 times. Spraying liquid per acre 40 to 50 kg.

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