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Tea stick thrips are in the order Taemonidae, Thripsidae. Occurs multiple generations a year. In recent years, the degree of harm in the southwest tea area has shown a trend of increasing year by year, affecting the yield and quality of tea, and increasing the cost of tea production.
The insect is harmful to the young shoots or petioles of tea trees, with brown markings and dry and shrunken buds. Pupae overwinter in soil crevices, dead branches and deciduous layers, and bark crevices. From late April to early May of the following year, the adult insects feather and spread to the back of the leaf to feed, and lay the eggs at the leaf veins on the back of the leaves, and the hatching nymphs are clustered and feed on the back of the young leaves and around the leaf veins.
Symptoms and characteristics of harm
Tea stick thrips can harm tea, peanuts, grapes, camellia, citrus, moon and other plants.
01
Harmful symptoms
Tea stick thrips to adult, nymph file suction as a pest of tea tree new shoots young leaves, victim leaves, the back of the main vein on both sides of the two sides of the longitudinal concave reddish-brown stripes, when the damage is serious, the leaves lose luster, scorch, fall off, leaving only the bud head, or the late buds shrink, the leaves are inward longitudinal, the leaf is hardened and brittle.
02
Occurrence characteristics
The insect occurs in the southwest tea area for 9 to 10 generations a year, the insect state has no obvious overwintering phenomenon, and adult insects and nymphs can be seen on the young shoots in winter, and 1 generation can be completed in general 20 to 25 days. From May to June, the development accelerates, and the number of days required to complete the first generation is correspondingly shortened. Adults lay eggs in the flesh of the leaf dorsal leaf, and the hatching nymphs cluster on the back of the leaf or around the leaf veins to file the sap of the budded leaves, and the 2nd instar nymphs feed the most, causing the most serious damage, pupating in the lower part of the tea bush or under the dead leaves near the soil surface. Adults are active and good at crawling. In the shade of the sun or in the morning and evening, it inhabits the shade of the lower layer of the tea plant, and the most serious damage is from mid-August to early October, and it is generally serious in young tea gardens.
03
Habits of life
Nymphs are 4 and 3 years old, stopping feeding and turning into soil crevices and pupating in dead branches and deciduous layers or bark crevices. Adults can feed on both the back and front of the leaf. It generally appears on the leaves of tea trees in mid-to-late May, which is the first generation of harm, and from late July to mid-August, the pest peaks, and the second and third generations are harmful, during which generations overlap. In May, the insect population in the tea area began to rise, and the insect population reached its peak in September and October. The insect is tender and mostly concentrated on new shoots, young shoots and 1 to 3 leaves under the buds. Adults have a strong tendency towards blue. The eggs are laid under the dorsal epidermis of buds or young leaves, and the hatching nymphs crawl out of the leaf flesh and move in place. Young nymphs mostly inhabit young shoots or the back of young leaves, and instars 3 and 4 do not feed. The degree of damage varies greatly among different tea varieties, with small and medium-leaved varieties suffering heavily.
Prevention and control methods
Agricultural control
Qingyuan
After the autumn tea picking is completed, it is pruned in combination with the winter management of the tea garden to remove the dead branches and weeds of the tea garden. The method of implementing tea garden closure is to spray a Baume 0.6 stone sulfur compound at an average temperature of 10-15 °C in autumn, and then spray a 0.8-1.2 stone sulfur compound in Pomeria for 7 to 10 days to kill overwintering adults or egg masses and reduce the insect population base. When spraying, spray evenly to no dripping, focus on spraying the lower middle and lower parts of the tea plant and the back of the leaves.
Strengthen fertilizer and water management
Reasonable application of nitrogen, phosphorus, potassium fertilizer to promote the growth of tea plants, it is recommended to apply a reasonable ratio of tea plant special fertilizer, the formation of tea sticks is not conducive to the activity and survival of tea sticks thrips.
Protect predators
Pay attention to the protection of predatory natural enemies such as small black spiders, predatory mites, large red mites and ladybirds in tea gardens, so as to achieve the purpose of treating insects with insects and effectively controlling tea stick thrips.
4
Timely harvesting in stages and batches
Batch picking can reduce the time of new leaf retention, in order to worsen the nutritional conditions of pests and take away some eggs, reduce the population base of insects, and reduce the damage.
Physical control
According to the characteristics of adult insects on blue, the placement of armyworm blue plates in tea gardens does not pollute the tea gardens, and can effectively control tea stick thrips, and it is advisable to place 350 to 375 blue plates per hm2 tea garden.
Biocontrol
According to the forecast, 7-10 days before the peak period, an amma 300 to 500 times liquid + matrine 500 times liquid spray is selected, sprayed once in 5 to 7 days, and sprayed 3 times in a row, which has a better control effect on tea stick thrips.
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