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Harmful shape? Injury jujube tree buds and young leaves, leaves after the victim, the leaf edge curled upward, the young leaves into a tube, from green to purple, crisp and hard quality, larvae feeding in the leaf cylinder. The victim leaves become brown or black later, and the petiole is formed off the layer. The worms occur early, have many algebras, have a long duration of damage, and have a greater impact on seedlings, sapling development, and mature tree bearing. They are one of the main leaf pests of jujube trees.
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Morphological characteristics adults? Worm body mosquitoes, orange-red or gray-brown. Female body length 1.4--2.0mm, head, chest yellowish yellow, thoracodorsal uplift, dark brown; compound eye black, tentacles grayish black, female abdomen large, a total of 8 nodes; male slightly smaller body length 1 .1--1.3mm, grayish-yellow, well-developed antennae, half-length body, slender abdomen.
Egg? Nearly conical, 0.3mm long, translucent, early egg white, red after, shiny.
Larvae? Cocoon-shaped, 1.5--2.9mm long, milky white, without feet. The dragonfly is naked, spindle-shaped, 1.5--2.0mm long, yellow-brown, with 1 pair of horns on the head.茧 Long oval, 2 mm long, silky, off-white, outer clay particles.
Life history and habits
?? The insects occurred in North China in the first year of 5--7 generations, and the mature larvae lived in the soil for wintering. In April of the following year, adult eclosion emerged, and on the jujube bud just after germination, it entered the stage of damage in early May. The young leaves curled into a tube. There was a larva of 5 to 15 heads in one leaf, and the dead leaves were black and senile. With the landing of leaves, the adult eclosion occurred in early June and the average life span was 2 days. Except for overwintering larvae, the average larval period and pupa period were 10 days.
Control methods
??1. Plowing eliminates overwhelming insect sources: At the end of spring in spring, 50% phoxim is sprayed on the ground. 0.5 kg per mu is used. After spraying, the larvae can be killed. In the fall, 5% dipterex powder or 25% phoxim 1000 times is sprayed on the ground, and the overturning insect source is eliminated by combining the gardens. In the winter of December, the tree tray was turned slightly, and the insects were frozen and killed to eliminate the source of overwintering insects.
??2. Canopy spray: 15 days before germination, spraying 3000--4000 times cypermethrin or deltamethrin, insecticidal rate of 95%. When germinating leaves (approx. mid-April), it prevents adult worms. May 2000 1-3000 spray 2000--3000 times to kill cypermethrin or deltamethrin, times liquid, 10 days after spraying 1 times, control adult. From June 1 to June 5, spray 2000--3000 times to kill cypermethrin or deltamethrin to control adult worms.
??3. Clean up the source of the insects: In October, clear the branches, leaves, and fruits on the trees and under the trees and burn them in a centralized manner to reduce the source of overwintering insects.
??4. Improve fertility by fertilizing: In November, basal fertility increased the tree vigor in the following year, which is the key to high insect resistance. Foliar spray fertilizer: During the growing season, once every 10 days, the foliar fertilizer is sprayed to 0.5% urea. It is mainly composed of 0.5% potassium dihydrogen phosphate; Soil topdressing: topdressing chemical fertilizers for 2 to 3 times throughout the year, with top-dressing in mid-May, mid-late May, late June and early July, respectively. Urea, ammonia bicarbonate, ternary compound fertilizer based.
Jujube Mosquito
Jujube Mosquitoes? Contarinia sp. Alias ​​jujube buds. Diptera is a mosquito. The worm distributes all the jujube areas in the country.