Mango in Hainan as an out-of-season fruit tree, is now in the flowering stage, in the flowering stage of the young fruit stage of the most headache for farmers is the control of mango thrips. Through visits and surveys, more and more farmers have reported that the thrips on mangoes are becoming more and more difficult to fight, and the annual cost of pesticides invested in the prevention and control of thistle horses is very high, but many times it is either not dead or not long.
If the thrips are left unchecked, they will multiply in large numbers, and then endanger the young fruits and young shoots, causing the part around the fruit stalks of the young fruits to be bitten by the thrips and have a large area of wounds, and then become brown after being oxidized by the air, and the wound spots will also become larger after the fruit is expanded, and then become a peel fruit, which seriously affects the quality of the fruit; secondly, the young shoots and young leaves are sucked by the sap and become wrinkled, and finally dry, affecting the mango tree posture.
<h1 class="pgc-h-arrow-right" > so why are thrips getting harder to beat? </h1>
1, the thrips themselves have strong fecundity characteristics
The thrips that harm mangoes are called tea yellow thrips, they can reproduce in mangoes all year round beans, especially in the summer and autumn can occur more seriously, the main reason is that the temperature and humidity of these two seasons are suitable for their activities and reproduction; secondly, they have two breeding methods, one is parthenogenesis, that is, no mating, no male adults can also reproduce, in short, it can reproduce indefinitely, the other is gender reproduction, but it is relatively rare, so it will occur so seriously.
2. Farmers have a poor sense of active prevention
Many farmers have insufficient understanding of the harm of mango thrips, they are only insects when they see insects, they think that there is no waste of insect spraying, and when the thrips harm the young leaves to show the phenomenon of shrinkage or fall flowers, they realize that they want to fight thrips, but at this time, the thrips have broken out, and the difficulty of prevention and control has become greater.
3. Farmers have a weak awareness of the rotation and use of drugs
At present, there are not many pharmaceutical ingredients on the market that can effectively control thrips, mainly including methylphenidate, neonicotinoid (imidacloprid, thiamethoxamine, etc.), spirant ethyl ester and ethyl polybactericide. These agents in addition to ethyl polybactericide is a patented compound, other are often used agents, and many manufacturers have, although the trade name is different, but the ingredients are the same, used for a long time more or less will have a certain resistance.
For example, the thrips seen on the market - nongzhou line, extinction, etc. Although their trade names are different, but in fact, they are 5% methyl vitamin salt microemulsions, many farmers only look at the trade name and do not look at the ingredients, resulting in the long-term use of the same agent to beat the thrips, the prevention and control effect is becoming worse and worse, three days and two ends have to fight once, increasing the cost.
4. The time node of drug prevention and treatment is inaccurate
For mango, the flowering stage, the young fruit stage and the young shoot stage are the key periods of thrips hazards, generally in the young buds just pumped and ready to flower before the thrips mouth base is relatively low, it is necessary to use the drug in advance when the insect mouth base is low for prevention, inhibit the outbreak of thrips, reduce the difficulty of prevention and control.
5. The foliar fertilization is not in place, and the young leaves are not ripe in time
These people have great doubts about this foliar fertilization, saying that this fertilization has nothing to do with the prevention and control of thrips. In fact, thrips and other pests like to eat mango young parts, especially young leaves, young shoots, etc., if the young leaves, young shoots are not matured in time, then it will provide thrips with more abundant food, increase the occurrence and harm of thrips.
6, orchard management is not in place
Some fruit farmers planted mango trees are too dense, affecting the ventilation and light transmission of the orchard, and there is no timely pruning of the fruit trees, so that the whole tree is shaded and opaque, which will create good living conditions for the thrips; if the continuous encounter with warm and dry weather, not watered in time, will make the pupae hidden in the soil feather, breed, aggravate the harm of the thrips.
7. Too many melons, fruits and vegetables planted next to the orchard will also aggravate the occurrence of thrips in mango orchards
Thrips are an omnivorous pest, their hosts are more, that is, they can eat a lot of harmful crops, almost all flowers can have the presence of thrips, so after the mango is pumped and flowered, the thrips that were originally harmful on the surrounding melon fruits and vegetables will be transferred to the mango for harm.
<h1 class = "pgc-h-arrow-right" > there are not many thrips that can be used in fact, and only full and rational use plus scientific management of orchards can achieve the most effective control effect</h1>
For the prevention and control of mango thrips, many people say that three points rely on medicine and seven points rely on management, which makes some sense. Thrips are small, easy to hide, warm drought and young leaves and other conditions are conducive to their reproduction, harm, if cut off their food sources, create an environment that is not conducive to their survival, while using drugs to suppress the outbreak of the "head", then thrips do not have a difficult phenomenon, which is the principle of preventing and controlling thrips is also the most efficient method.
1, create an environment that is not conducive to the survival of mango thrips
First of all, do a good job of field management is the first step, after the mango harvest, it is necessary to carry out the operation of clearing the garden in time, cut off the disease-susceptible branches, intersecting branches or long branches, so that the fruit tree body is ventilated and transparent, reducing concealment; at the same time, the use of chemical agents to spray the whole garden, kill adults and eggs, and reduce the insect population base of thrips.
Secondly, in the event of high temperature and drought, the mango tree should be watered in time, the soil is moist; or the grass cultivation can be carried out in the orchard to improve the humidity of the orchard, reduce the success rate of feathering and egg hatching of thrips pupae, and greatly reduce the insect population base.
2. Reduce the food source of mango thrips
In orchards, young leaves and flowering vessels of mangoes are the main food source of thrips, and they use mouthparts to suck the sap of young leaves and flowers, causing the leaves to curl, wilt, and fall off, withholding, and the result rate is low. If the leaves are ripe, then the thrips will not continue to harm the leaves, so it is key to make the mango leaves ripe as soon as possible. After the early application of the seedling and flower-inducing fertilizer, the new shoots can be matured to about 20-30 cm and the young leaves can be matured using 99% potassium dihydrogen phosphate.
Outside the orchard, try not to grow fruit and vegetable crops, which can reduce the food source of thrips and will not cause large occurrences due to staggered hazards.
3. Chemical agents inhibit the "budding" of thrips outbreaks
There are indeed not many medicines that can effectively control mango thrips, and if they are not fully and rationally utilized, it will lead to an embarrassing situation in which there is no medicine available to prevent. As mentioned earlier, thrips like to eat young and tender parts, especially young leaves, flower utensils and young fruits, so it is necessary to strengthen the awareness of prevention, when the young leaves are just withdrawn, before the flowers bloom and after the flowers are timely drug prevention and control, and should be reasonably rotated according to the different characteristics of different periods and different agents.
Before the mango buds are 2-3 cm or flowered, 25% high-efficiency cypermethrin can be used· Thiamethoxamine - microcapsular suspension agent 2000 times foliar spray, this advanced dosage form of action fast, long duration of action, 7-10 days again spray, rotation of the use of agents, until the leaves are mature;
If the problem of pollination at the flowering stage is taken into account, it can be sprayed with 22.4% helioethyl ester suspension + 5% methyl vitamin salt suspension 1000 times, but it needs to be applied about 5 days in advance, because the effect of ethyl spirant is relatively slow, about 5 days to take effect, but the effect period is very long, and at the same time it is relatively safe for flies, because the flowers of mango mainly rely on flies for pollination;
If thrips have already occurred, choose a fast-acting agent such as thioseamine + methylvidate, two different ways of acting, to speed up the rate of dead insects and reduce the rapid production of resistance. In areas with high resistance, it is recommended to use new ingredients such as ethyl polybactericide or a combination of multiple agents, and add synergistic additives to improve the effectiveness.
The above is the experience shared by the author through practice, I hope to help you; in fact, it is not difficult for the prevention and control of mango thrips, the difficulty is whether you can insist on doing a good job in the comprehensive work of the above points, what do you think?