Longan white moth wax cicada, is a kind of pest often encountered in the longan planting process, in recent years, it has become more and more serious, especially in the summer and autumn when the high temperature and high humidity, if the improper control leads to the outbreak of the white moth wax cicada, it will have a serious impact on the tree potential of the longan and the later yield and quality, so that farmers have a headache.
<h1 class= "pgc-h-arrow-right" >, why does the occurrence of "white moth wax cicada" give farmers a headache? </h1>
1. The harm of white moth wax cicada is great
After the occurrence of white moth wax cicadas in longan trees, their adults and nymphs will gather together in large numbers of branches of longan trees, especially on hidden branches for feeding hazards, they will use mouthparts to suck the sap of branches, which will lead to weak branches, leaf wilting, and eventually weaken the tree;
In addition, the feces excreted after the white moth wax cicada eats contain a large amount of honeydew, and the soot bacteria will use these honeydew as growth nutrients, and then continue to multiply to cause soot disease in a large area of the longan tree, which seriously affects the photosynthesis of the leaves, and the growth of the longan is undoubtedly "worse".
Causes "soot disease."
2. White moth wax cicadas have a wide range of food
White moth wax cicada is one of the main insect pests for longan, but in addition to harming longan trees, they can also eat on fruit trees such as mangoes, lychees, citrus, guava, etc., so they have a wide range of food sources; at the same time, adult insects have short-distance flight capabilities, so they have certain transfer hazard characteristics, which is very important for fruit farmers.
3. It is difficult to control the white moth wax cicada
White moth wax cicadas are somewhat similar to earthworms, their body surfaces are covered with a wax layer or wax filament, and the adults have a certain ability to fly, which leads to conventional, no systemic effect or no strong permeability of the agent can not effectively kill them, so in the white moth wax cicada outbreak of a large number of fruit farmers will be more difficult to control.
<h1 class= "pgc-h-arrow-right" > two, so what does a "white moth wax cicada" look like in the field? Let's take a look</h1>
· Adults grow like this: the average body length of the white moth wax cicada is about 23 mm, the body color is usually white, but there are also parts of pale green, and the adult body indicates that it is wrapped in a layer of wax powder, and the hand touches them, leaving a layer of white wax powder; the adult head is more pointed and tapered, and the back has three more slender ridges, showing a raised state; the forewings of the adults are shaped like a triangle, and the hind wings are relatively short and translucent. Therefore, if you look at it from a distance, you will find that the adults will merge their wings and stop on the branches to feed, like a white "paper airplane".
· The nymphs look like this: the nymph body of the white moth wax cicada is flattened and oblong, and the whole body is white, and the body is surrounded by a white, soft waxy substance like cotton, and many slender white wax filaments grow on the back of the tail; the frontal observation will be as beautiful as the "peacock opening screen" or the legendary "nine-tailed demon fox".
· The eggs are as long as the eggs of the white moth wax cicada are oblong-oval, like a grain of pale yellow rice, and the eggs are usually laid in a more hidden place, and they are laid together in a row-by-row form, and if you look closely, you will see that the surface of the eggs has obvious reticulations.
<h1 class = "pgc-h-arrow-right" > third, what factors in the field will cause the occurrence of "white moth wax cicadas"? Be careful</h1>
1. First of all, it is related to the strong reproductive ability and good concealment of the white moth wax cicada
Although the white moth wax cicada can only occur in 2 generations in a year, the female adult has the ability of parthenogenesis, they rarely reproduce in both sexes, so in the case of sufficient food sources, it is no exaggeration to say that they can reproduce indefinitely; at the same time, they like to hide in the dense branches or more hidden inner halls for feeding and reproduction, while nymphs and adults are covered with waxy material protection, so they have a strong ability to survive.
2. Secondly, it is related to the appropriate environmental conditions in the field
Although the white moth wax cicada begins to feed in the spring when the air warms up, the temperature and humidity in the field are not so good at the moment, so they will not multiply and feed in large quantities; when there is high temperature and high humidity weather in summer and autumn, they will be frequently active, including feeding, mating, etc., so the temperature and humidity in the field will aggravate the occurrence of white moth wax cicadas.
3. Finally, it is related to the deficiencies in human prevention and control
The misuse of large quantities of highly toxic chemicals has led to the accidental killing of a large number of predators
As mentioned earlier, part of the reason why the white moth wax cicada has become more and more serious in recent years is that its natural enemies such as grasshoppers, ladybirds and praying mantises have disappeared, because fruit farmers rely too much on chemical agents for the control of pests and diseases, and the abuse of a large number of highly toxic pesticides will kill a large number of natural enemies by mistake, resulting in a large number of white moth wax cicadas without the constraints of natural enemies.
Fruit growers did not grasp the appropriate period for the control of white moth wax cicadas
White moth wax cicadas are in the form of adults and nymphs for wintering, to the second year of the spring temperature rises they will carry out feeding activities, this is the best time to kill a generation of nymphs, because the nymphs at this time in addition to low resistance, their wax filaments are relatively small, while killing this generation of nymphs can reduce the later generation of the occurrence base, but many farmers are to see adult insects to start fighting insects, resulting in less than ideal control.
After the harvest of longan, the work of clearing the garden was not meticulous
After the weather enters the winter, the white moth wax cicada will be in the form of adult insects and nymphs in the trunk, branches or leaf backs, bark cracks and other more hidden places for wintering, if the fruit farmers in the garden does not prune the longan tree or do not pay attention to the spray garden of hidden places, then most of the white moth wax cicadas will successfully overwinter and aggravate the harm of the next year.
<h1 class="pgc-h-arrow-right" >4, understand the efficient control strategy of "white moth wax cicada" to reduce harm and annoyance</h1>
For the control of the white moth wax cicada, after all, it is also a plant-eating insect, and if you want to eliminate them, it is nothing more than reducing their food source, destroying their comfortable living conditions, and then scientifically using chemicals to suppress their outbreak, so as to effectively reduce the occurrence of white moth wax cicadas.
1. Reduce the food source of white moth wax cicadas
Adults and nymphs of white moth wax cicadas like to eat the relatively young parts of the longan, so the new shoots are the harmful parts of the white moth wax cicada, so the fruit farmers must apply fertilizer before each batch of new shoots to make the young shoots unified and withdraw neatly as soon as possible, and then when the new shoots grow to the right length, they can use foliar fertilizer to spray ripening to reduce the harm; at the same time, they must control the withdrawal of winter shoots through various means such as drugs and root breaking, so as to reduce the food source of the white moth wax cicadas.
Secondly, it is best not to plant lychees, mangoes or citrus near the longan garden, and other white moth wax cicadas can also eat harmful fruits, which can reduce the food source of white moth wax cicadas, reduce their transfer hazards and reduce the difficulty of control.
2. Destroy the comfortable living conditions of white moth wax cicadas to reduce the source of insects
White moth wax cicadas like high temperature and high humidity living environment conditions, so for the control of white moth wax cicadas, it is to destroy the high temperature and high humidity in the orchard and hidden hiding places, so that their survival has no comfort zone, so as to reduce the source of insects;
First of all, it is necessary to prune the longan tree in a timely manner, cut off the overlapping cross, long branches, diseased and insect branches, etc., and then cut off the excess branches to let the fruit tree "open the skylight", and the inner hall is ventilated and transparent, so as to reduce the humidity of the tree and reduce the harm of the white moth wax cicada;
Secondly, in addition to pruning and cleaning up the debris in the garden in winter, it is also necessary to use high-efficiency insecticides for spraying the whole park, especially for hidden branches, bark cracks, etc. to be sprayed wet, and fieldside weeds should also be sprayed, so as to effectively kill overwintering adults and nymphs to reduce the harm in the coming year.
3. The use of high-efficiency insecticides to inhibit the outbreak trend of white moth wax cicadas
Strengthen green prevention and control
If the field of white moth wax cicada mouth base is small, you can use environmentally friendly green means to control, such as the release of artificially raised natural enemies such as ladybugs, praying mantises, etc. in the orchard, to choose to release when the weather is clear, while reducing the use of highly toxic chemical agents, so as to ensure the prevention and control effect of natural enemies;
In addition to releasing natural enemies, when the white moth wax cicada occurs in the field, the insect net can be used to hunt, which can effectively reduce the harm of the white moth wax cicada.
Choose safe and efficient insecticides for control
Prevention and control period: the first generation in the following year in the spring, the second generation is the summer and autumn high temperature and high humidity season, but the focus on the prevention and control of the first generation, so as to reduce the second generation of production and harm.
Recommended solutions:
For the control of white moth wax cicadas, the use of insecticides is the most efficient, but also the last line of defense for prevention and control, so fruit farmers should learn to use drugs rationally and flexibly according to the insect situation when using drugs, so as to improve the control effect.
If it is early prevention or the number of white moth wax cicadas in the park is small, it can be sprayed and controlled by using 20% furoxamin suspension 2000 times + 22.4% helioethyl ester suspension 3000 times, which can quickly kill adult insects and nymphs, and at the same time maintain a long period of effectiveness due to the action of heliosper ethyl ester.
If the white moth wax cicada has occurred in the park, and the insect mouth base is large, it can be used 40% chlorpyrifos emulsion 1000 times + 22.4% heliopyridine ethyl ester suspension 2000 times + 5% pyrapropyl ether suspension 1000 times for uniform spraying, which can quickly kill adult insects, and at the same time has an effect on nymphs and eggs, which has both a quick effect and a period of effectiveness.
In short, the white moth wax cicada is a kind of chronic harm to the longan tree pest, although the initial did not find obvious symptoms of harm, but in the later stage of the serious outbreak will find that the longan tree has a large area of soot disease and tree weakness, etc., so the prevention and control of the white moth wax cicada can not be sloppy, you need to do a good job in all aspects of the work to reduce their occurrence and harm.