Star Cow
Citrus star tianniu is a pest of the coleoptera family, also known as foothoppers, packed insects, flower cattle, etc., mainly harmful to citrus, loquat, pear, peach, apricot, apple, fig, cherry and other fruit trees. In recent years, with the exponential growth of citrus planting area, some orchards with relatively poor varieties have gradually become abandoned orchards because their benefits are not guaranteed.
<h1 class= "pgc-h-arrow-right" > morphological characteristics</h1>
Female adults are 22 to 35 mm long, with antennae about 1.3 times the body length, and the end of the last segment is off-white. The male adult is 20 to 29 mm long, with antennae about 2.5 times the body length, and the end of the last segment is black. Adults are black and shiny; antennae are filamentous, 11 segments, and the base of each segment is grayish-blue from the third segment; the anterior thorax has a lateral spike; there are about 20 stripes of different sizes composed of white villi on the elytra, and the base of the wing is smooth without small protrusions, and only a few small tumors are on the inside of the shoulder angle. The eggs are milky white, oblong-oval, 5.5 to 7 mm long, with slightly curved ends. The larvae are yellow, about 50 mm long, the posterior half of the dorsal plate of the anterior thorax is darker, convex, and there is no dark thin edge at the anterior edge; 1 to 7 abdominal segments have a step bubble on each dorsal ventral surface, and there are 2 transverse grooves in the center of the dorsal step bubble, and 1 ventral surface. Pupae are milky white to yellowish white, 30 to 37 mm long and about 11 mm wide, with a curled antennae in a circular shape, placed on the forefoot and midfoot and wings.
<h1 class="pgc-h-arrow-right" > second, hazard characteristics</h1>
Tianniu mainly uses larvae to drill the branches of the tree fruit trees of the moth forest, the adult insects will lay eggs in the gaps of the young buds, after the eggs hatch, the hatching larvae enter the cortex from the young buds, first harm under the cortex, and then gradually enter the xylem hazard, and leave a large amount of insect feces in the worm road, part of the insect feces will flow out of the worm road, affecting the growth and development of the tree, making the tree weak, resulting in the invasion of pathogens, and it is easy to be broken by the wind. When the damage is severe, the whole plant dies, the wood is mothed, and it loses its use value.
<h1 class= "pgc-h-arrow-right" > third, the law of occurrence</h1>
It occurs in one generation a year and overwinters as larvae in the xylem of the infested host. The overwintering larvae begin to move after March of the following year, generally starting at the end of March, most of the larvae grow 3.5-4 cm, the width of the pupae chamber and the circular feathered hole that passes through the epidermis, the insect body gradually shrinks, does not feed, lies in the pupal chamber, begins to pupate when the temperature stabilizes above 15 ° C in early April, and pupates basically end in late May. Adults begin to feather in early May, and at the end of May and early June are the peak of adult holes, and the adults stay in the pupae for 4-8 days after feathering, and only go out from the round feathering holes after the body hardens, nibble on the bark of the host's young branches for supplemental nutrition, and lay eggs after 10-15 days. The Celestial Calf prefers to lay eggs on weaker trees, and each female Can Lay up to 200 eggs in a single mating, and each egg is separated and hidden in the bark. The spawning site is larger than 5 cm in diameter and is generally less than 2.5 m above the ground. Oblong oval, slightly larger at one end, 4.5-6 mm long and 2.1-2.5 mm wide. It is white at first birth, gradually becomes milky white, has a short egg period, and begins to hatch in 7-10 days. The peak period for larval hatching is in mid-to-early June, with the larvae invading the xylem about a month after hatching and overwintering with mature larvae in late October.
<h1 class = "pgc-h-arrow-right" > fourth, integrated control</h1>
1. Biological control
Cultivating natural enemies and maintaining the balance of ecological nature should be the easiest and most effective way to "fight bulls", if possible, you can artificially cultivate natural enemies such as swollen leg bees and flower wool shells, which are very effective in destroying tianniu.
2. Artificial prevention and control
Artificial capture: In view of the habit of adult Tianniu insects in high temperature weather like lunch break, adult insects can be artificially hunted, and can also be combined with pruning and thinning, scraping and scraping eggs during the peak egg laying period of Tianniu adults, which can reduce the density of insect populations.
Artificial hookworm: In view of the dry habit of the Tianniu larvae, the wire with the hook can be used, like the hook yellow eel, to extend the wire into the worm road to hook out the Tianniu larvae for centralized killing.
Artificial coating of lime: In view of the habit of laying eggs at the base of the trunk of the adult tree of Tianniu, lime can be applied below 80 cm of the trunk before the adults occur, and the method of applying lime to the trunk can effectively prevent adults from laying eggs.
3. Pharmaceutical prevention and treatment
At the peak of larval feathering (adult worm out-of-hole peak period of 6-7 months), use [New Weiley] agent for control, spray the garden once in 5-7 days, the spray site is mainly based on the branch cadres, each spray, so that the liquid flows along the trunk to the root; or use the above agent to dry.
【Disclaimer】
The pictures in this article are collected from the network, have tried to contact the author unsuccessfully, if there is infringement, please inform this public account in time, we will delete it in the shortest possible time.