Lychee longan gall mite is extremely harmful, how to prevent it?

Introduction: Nowadays, with the continuous development of science and technology, people can buy fruits from other regions through online shopping, so as to meet their own fruit needs. Lychee longan is a common fruit in daily life, and lychee longan gall mites are extremely harmful, so how to prevent and control this disease, let me take you to understand.

1. Introduction. Lychee and longan as a typical southern fruit, in most areas of the south of our country are planted, with the continuous development of modern means of transportation, but also let more southern fruits into the northern region, so that more people love different types of fruits, although these two fruits taste very delicious, but we should not eat more of these two fruits because of deliciousness, if you eat more, it will lead to everyone on fire. Lychee and longan are not only eaten as fruits, but also sometimes used as medicinal herbs to cause diseases.

Second, the practice. Although lychee and longan may be easy to grow, these two fruits sometimes suffer from gall mites during the planting process, and you can use corresponding solutions to solve this damage, and you can also use a combination of control methods. After the fruit is harvested, we need to prune the branches and leaves of the fruit tree in time so that the insects do not have too many nutrients to support them during the winter.

In orchards, you can smoke the insects on the trunks of fruit trees throughout the year to reduce the number of insect infestations. If there are too many insect infestations on the fruit trees, you should use medical methods to clean the fruit trees. <>

3. Summary. In most areas, the varieties of fruit trees planted are different, and the cultivation methods are very different. This requires that when planting fruit trees in different regions, the fruit trees should be analyzed according to the local conditions.

This minimizes the number of problems caused by fire during the planting process and potentially maximizes the farmer's income.

In this case, you should spray some insecticides on his leaves or roots, and the distance between them should be controlled, which should be kept at about 15 cm, so that all the roots can receive sunlight and be killed by high temperature.

For densely planted orchards, we should be willing to cut down trees, so that the orchard planting density is reasonable, ventilation and light. The shady inner branches, drooping branches or overly dense branches should be pruned in time. Once a damaged branch is found, it should be cut off and burned immediately.

There are all methods of prevention and control, quarantine treatment: quarantine is implemented when transporting seedlings, the damaged leaves are cut, and the seedlings are treated with acaricides. Agricultural control:

Reasonable pruning to improve the permeability of the orchard, especially after fruit picking and pruning in winter and spring, collect residual branches and leaves, and concentrate on burning to reduce the source of mites. Pharmaceutical control: in the spring shoot spike stage and autumn shoot germination stage, according to the insect situation detection and report in time to pick and treat or organize the whole garden spraying control, commonly used pesticides are 73 grams of mite emulsifiable concentrate 2000 3000 times, 20 speed miteone wettable powder 3000 times, Baumé stone sulfur mixture, avermectin 3000 4000 times liquid, azadirachtin insecticidal emulsifiable concentrate 400 times liquid, sheep horn twist aqueous solution 500 times liquid, etc.

Preventive pesticides should be chosen, and attention should be paid to the cultivation skills of lychees, and regular observation and management should also be taken into account.

Quarantine treatment, pruning the damaged leaves and spraying acaricide to treat the seedlings. Reasonable pruning to improve the permeability of the orchard, spring shoot flower spike stage and autumn shoot germination stage, timely selection and treatment according to insect detection and report, etc.

Ecological control: The orchard is interplanted with Huo Xiang thistle, and no weeding is done before and during the shoot release period, which can maintain the ecological balance of the orchard, promote the habitat and reproduction of natural enemies, and achieve the purpose of controlling gall mites.

Pesticide control: In the case of high insect population density, 25% Beleba wettable powder 1000 1500 times, 20% Apollo suspension 1500 2000 times liquid, 73% Kemite emulsifiable concentrate 1500 2000 times liquid before tip extraction or young leaves.

Agricultural control: Combined with post-harvest pruning of lychee, remove gall mites as harmful branches and overly dense shade branches, weak branches, and diseased branches, so that the crown is properly ventilated and light-transmitting, which can significantly reduce the source of insects and is not conducive to the occurrence of gall mites. Controlling winter shoots is also an effective measure to reduce the source of insects. It is especially important for young trees.

In addition to lychee borer and lychee bug, the main pests of longan include Bacteroides, longan chicken, white moth wax cicada, etc. The nymph sucks the sap on the back of the leaf of the young longan, and the broken point protrudes to the leaf surface in a carapace, and the nymph hides in the back cavity of the leaf in the form of a nail. When the insect population density is high, the leaves shrivel, turn yellow, and fall off early.

Adults also suck the young shoots, young leaves and young stems of the flower spikes of longan. Longan chickens and white moths use adults and nymphs to suck the sap of longan branches, so that the branches dry up and the trees weaken.

Its excrement can induce soot disease, which will reduce the quality of fruit and affect the yield in severe cases. Prevention and control measures can be taken: strengthen fertilizer and water management, so that the new shoots are drawn neatly, return to green quickly, and reduce harm.

After harvesting, prune and shape in time, cut off the overly dense branches and leaves, and make the orchard ventilated and transparent; The application of sufficient basal fertilizer to promote the growth of longan trees can improve the insect resistance of longan to major pests, especially to Penicillium longan. In winter, combined with fertilization measures, remove dead branches and fallen leaves and weeds in the garden, and manually scrape the longan chicken eggs on the trunk to reduce the source of overwintering insects.

At the beginning of longan extraction, spray control was carried out with 10% high-efficiency 100 grams of liquid, 5% imidacloprid emulsifiable concentrate and 200,300 times of engine oil emulsion. Combine agricultural control with post-harvest pruning, cut off compound leaves with high population density, and focus on elimination. Strengthen fertilizer and water management, so that the new shoots grow neatly and return to green quickly, so as to quickly get through the dangerous period of suffering.

Observe the shooting cycle and determine the control object. In the full flowering period of adults, longan trees with new shoots are the target trees that need to be controlled, so it is necessary to take medicine to control nymphs during the full flowering period, focusing on the first and fifth generations.

You can choose systemic insecticides or fumigation and contact pesticides, such as 100 g psyllium; Big Hero 20g; chlorpyrifos 20 g; Dichlorvos 100 grams. Any one of the above agents can be sprayed with 50 kg of water, and the control effect can reach more than 95%. Operational techniques.

The spraying operation is mainly controlled from the inside out, that is, spraying from the inside of the canopy, paying attention to the back of the leaves, and spraying both new and old leaves. Because the new leaves are the source of this generation, and the old leaves are the source of the previous generation, only by eliminating all the sources can we achieve complete control.

Pesticides. Because after the longan tree in my house was sprayed with pesticides, the gall mites disappeared, so I thought that pesticides should be used to control them.

Immediately, the garden was cleared and planted, and the thistle was planted in the park and the surrounding open space to facilitate the predation of natural enemies and the habitat and reproduction of mites. Spraying during the active period of transfer of gall mites in the new shoots.

In such a situation, we should spray some sterilizing drugs, so that it can play a good role and be effective.

<> lychee gall mite is also known as lychee gall tick, lychee hair spider, and the killed leaves are called felt disease. For the harm of lychee and longan. Adult mites and mites are harmful to tender shoots, leaf slices, flower spikes and young fruits, and suck the juice.

The infested leaves first appear yellow-green patches on the back, the pest spots are sunken, the front is protruding, and dense hairs grow in the depressions, which resemble felt, that is, the so-called galls. The surface of the damaged leaves is twisted and uneven, and even withers and withers. After the flower is damaged, the deformity swells into clusters and does not bear fruit.

Habits: More than l0 generations occur in a year, and adult mites and nymphs overwinter among the gall villi. The density of insect population is the highest from May to June, and the damage is more serious during this period of the year.

The leaf surface of the victim is prominent, and the flower spikes of the victim are swollen like clusters of inverted bells. The gall grows within half a year, and the insect population density is the highest. Gall mites live among the gall villi and are more active when exposed to sunlight or rain, wriggling up and down between the villi.

Spawn at the base of the villi. The gall mite prefers shade, dense canopy, poor light environment, the lower part of the canopy and the interior are cautious, the insect population density is larger, and the leaves are mostly dorsal leaves. Gall mites can spread through seedlings, insects, equipment, and wind.

Lychee and longan seedlings are mostly propagated by high-altitude strips, so seedlings are the main way for gall mites to spread.

Prevention and control methods: lIn winter, pruning is combined to cut off the damaged branches and leaves.

2.In February to March when the flower spike and leaves are beginning to form galls, spray wine Baumé stone sulfur mixture, can also use a mixture of 50% dichlorvos emulsion, 40% dimethoate emulsion and water (its ratio is l:l:

2000), or dicofol emulsion 800 times. 3.When transporting seedlings, check and remove insect leaves to prevent insect pests from spreading to new areas.

(1) After fruit picking, combined with pruning, cut off the damaged branches and leaves, weak branches and shaded branches to reduce the source of insects.

2) Control the occurrence of winter shoots and interrupt their feeding**.

3) Retain and plant thistle to stabilize the ecological balance of the orchard, promote the habitat and reproduction of natural enemies, and control the harm.

4) 1000 times of Lesben EC can be used for the control of flower buds, 20% emulsifiable concentrate 2000 times can be used for the control of litchi pedicle borer at the young fruit stage, and 300 times of 50% sulfur suspension can be used for the control of autumn shoots.

1) Cut off the "ghost flowers" and "ghost tips" in time, and take them out of the orchard and burn them.

2) Retain and expand the cultivation of thistle, which is conducive to the habitat and reproduction of predatory mites.

3) It is known that in the early stage of longan flower spike extraction, avermectin EC 1000 1500 times or Lesben EC 1000 times can be used for prevention and control; In the early stage of autumn shoot extraction, it can be controlled with 800 times of 50% dimethoate emulsifiable concentrate.

Prevention and control methods of longan terminal bud gall mites: Strengthen management, reasonable fertilization, promote rapid and neat extraction at each shoot stage, combined with pruning and pruning, prune pest and disease branches, reduce insect sources, and reduce damage.

Spraying control. For orchards with heavy mite damage, it can be used 1 2 times during the peak stage of apical bud germination. You can choose to use 50% Torck (phenylbutyltin) wettable powder 1500 times, 20% mite (metamidine) EC 1000 socks 1500 times, or 5% Ba Mites suspension 1500 2000 times liquid spraying.