The scientific name Liriomyza bryoniae (Kaltenbach) belongs to the order Diptera, Liriomyza. Alias ​​is a bitter fly. Distributed in China, Japan, Europe, Africa, Israel. L. trifolii Burgess; L. strigata; L. sativae and L. sativae Flies (L.huidobrensis) et al. Five species of Liriomyza species are very similar in morphology.
Host Solanaceae, Cucurbitaceae, Cruciferae and other 36 families. Pleasing tomatoes, melons, lettuce and beans. It is a highly omnivorous pest and one of the six dangerous pests. Characteristics of the larvae The larvae may eat leafy flesh after hatching, and they show twists and turns of foodstuffs. The seedlings are often damaged by 2-7 leaves, and the serious latent marks are dense, causing the leaves to yellow, dry coke or fall off. The end of the insect pathway does not significantly widen, which is a distinguishing feature of this insect from L. sativa, L. huidobrensis, and L. sativae.
Morphological characteristics Adult wing length of about 2mm, in addition to compound eye, monocular triangle area, rear head and chest, back abdomen generally black, the rest and the small shield plate is basically yellow; both inside and outside the adult cicada are born in the yellow area, the rear valve 7 - 12 holes; egg beige, slightly transparent, size 0.2 - 0.30.1 - 0.15 (mm); larvae verrucous, early hatch colorless, gradient yellow-orange, old mature about 3mm; pods oval, slightly flat ventral, orange Yellow, size 1.7-2.30.5-0.75 (mm).
Life habits Liriomyza huidobrensis began to appear in Beijing in mid-March, with the first peak on May 12-19, and the second peak on June 23 and July 1 and July 28-August 18 No bugs on the day. The highest peak occurred on September 22 and September 22, and the population of insect population decreased after October 20. It appears that the worm had two peaks in the middle of May, early July and mid-September and mid-October. The worms occur in Taiwan all year round. Taiwan's Fengshan is 25 to 26 generations old. There are two main peaks in cabbage, once in March and June, and peak in April; the second peak is in October-December. In October, the peak was reached. The population density was higher in the first half of the year than in the second half of the year, and it was less frequent in the rainy season of July-September. In April and October, the average temperature was 25-27°C, and less rainfall occurred. After testing 15 °C adult life of 10-14 days, egg period of 13 days, larval period of about 9 days, about 20 days of the flood season; 30 °C adult life of 5 days, egg period of 4 days, larval period of about 5 days, flood season 9 Days or so. After the larvae matured, they gnaw the epidermis outside the leaves or under the surface of the soil. The egg production per female at 25°C is about 183 grains. Eggs on cabbage were prolific in true leaves, with the most basal leaves and partial maturity of the leaves. From the bottom up, there were more regular patterns, and fewer parts were produced on the cotyledons. This worm spreads in the field and it is a spread type. During the peak period, the whole field is killed. Natural enemies include Halicoptera circulus (Walker) and Opius phaseoli Fischer.
Prevention methods (1) It is forbidden to transfer and transport the vegetables and flowers in the quarantine area. (2) Biological control release of Diglyphus spp, Dacnusin spp. and Opius spp. Such parasitoids, these three parasitoids have a higher parasitism rate for Liriomyza. (3) The use of insect growth regulators can affect adult reproduction, egg hatching and larval peeling, and phlegm elimination. Yellow plates can also be trapped. (4) Advocate the use of 48% of chlorpheniramine (chlorpyrifos) EC 1500-2000 times, 1.8% ABA (Efortune) EC 2000 times, 10% of nicotine EC 1000 times, 10% Divided by 1000 times suspension agent, 5% Rui Jin Su suspension agent, 1500 times liquid, 40% Qixingbao EC 600 800 times, in the peak period of 5-7 days spray 1, continuous control 2-3 times. (5) The use of insect growth regulator 5% chlorhexidine 2000 times solution or 5% stuck solution 2000 times solution has infertility to the adult of the family Liriomyza. After treatment, the hatching rate of the eggs produced by the adults is low and the hatching larvae die. It is a kind of pharmaceutical agent with promising development. (6) In the absence of the above-mentioned chemical emergency, 25% iCAS EC 1000 times or 75% Saibunet WP 5000 times, 2.8% Dimethasone 1000 times, 98% Bataan soluble powder can be used. 2000 times, 50% phoxim EC 10oo times. Master the spray in the peak period of 5-7 days, 2 or 3 times in a row. 8-10 should be selected to prevent this insect. When the dew is dry, the larvae will start to move to the foliage. The most mature time for larvae to drill in the insect path is to spray the medicine.
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