In recent years, thrips have become one of the most important pests that threaten the industrial cultivation of mangoes, which has seriously affected the quality and yield of mangoes and reduced the planting income of farmers. This article introduces the hazard characteristics and control methods of mango thrips for the reference of fruit growers. First, recognize the harmful symptoms of thrips in mangoes:
1. The thrips in the shoot stage in the young back of the leaf juice in time, in severe cases can make the leaf back appear a brown, lose luster, the later leaf edge is curled, wavy, can not be unfolded, and even make the leaf dry.
2. Thrips cause the top buds of the new shoots to be affected, the growth is hindered, and the branches and leaves are overgrown or atrophied, causing the development of young branches.
3. When thrips harm flower spikes and young fruits, it will cause a large number of flowers and fruits to fall, and the fruit surface of the victimized young fruits will appear black-brown and rust-brown dots, which can even lead to fruit deformity and tissue thrombosis.
4. Thrips will also harm the petioles, young stems and old leaves of fruit trees, seriously affecting the growth of mangoes, and can also efficiently spread plant viruses, which seriously affects mango yield and quality.
Knowing the harm of thrips, you may say that it is controlled by insecticides, but fruit farmers use a lot of drugs to help, so why is it difficult to understand the thrips?
1, the dry season is easy to occur: climate drought is an important premise of the occurrence of thrips, thrips like warm, arid weather, its moderate temperature is 23 ° C -28 ° C, air humidity of 40% -70%.
2, closed, water-scarce orchards suffered heavily: orchard ventilation and poor light transmission, not only for the thrips to create a suitable shade environment, but also inconvenient to spray, thrips occur seriously. Orchards without irrigation conditions, dry soil and lack of water, are conducive to pupal and feathering of thrips, and the occurrence is large.
3. Thrips occur all year round, spring, summer and autumn mainly occur in the open field, female adults mainly reproduce parthenogenetically (unlimited reproduction without mating), occasional reproduction of both sexes, it is extremely difficult to see male insects. The eggs are scattered in the mesophyll tissue, laying 22-35 eggs per female. Female adults live 8-10 days. The egg stage is 6-7 days in May-June. Thrips reproduce extremely quickly and can cause devastating damage to crops if not controlled in time.
4, thrips resistance is getting stronger and stronger, because the thrips breed fast, coupled with many fruit farmers continue to use the same chemical drug, resulting in thrips resistance becomes stronger, which is also the root cause of thrips difficult to control.
So how to effectively control thrips? What must be followed is to take "prevention first, comprehensive prevention and control" as the core, use physical and chemical methods to comprehensive prevention and control, and look at the specific prevention and control plan.
<h1 class = "pgc-h-arrow-right" >1, strengthen the protection of natural enemies in the park</h1>
There are many species of natural enemies of insects and spiders in mango orchards, such as broad-bellied mantises, medium-yellow hunting bugs, lily bugs and other larvae that can prey on leafhoppers and lepidoptera can reduce the number of insect mouths.
<h1 class = "pgc-h-arrow-right" >2, scientific and reasonable field management</h1>
Strengthen the field management of mangoes, thoroughly clear the garden, remove weeds and dead branches and leaves in the field, and dry them when conditions permit; Reasonable pruning, appropriate pruning of some branches of the closed tree to enhance ventilation and light transmittance; According to the phototropism and chemotaxis of insects, booby traps are carried out using black light, yellow/blue plates, sweet and sour liquid, etc.
<h1 class = "pgc-h-arrow-right" >3, chemical control</h1>
In the sensitive periods such as the young shoot stage, early flowering and young fruit stage of mango and the thrips prone stage, the spray of 300 times of liangguoan + 600 times of vofon hormone + 1500 times of Aoman net matrine is used to promote leaf aging and reduce the food source of thrips. When thrips are endangered, it is controlled with a spray spray of Aoman net matrine 1000 times + garlic oil 1000 times. The same applies to other pests. It should be noted that thrips are afraid of strong light, field migration and rapid diffusion, for this reason, you should choose to spray prevention and control after 3 p.m. (when the light is strong to delay to 4 o'clock), the cycle of morning spraying and spraying is too long, and the prevention effect is poor.
<h1 class="pgc-h-arrow-right" > author of this article [Aofeng Chengcheng] More knowledge of plant protection, please pay attention to my headline number, or Baidu search for Aofeng manufacturer Chengcheng or private message to me, click the blue font below 'Learn more'</h1>