<h1 class="pgc-h-arrow-right" > preface</h1>
A few days ago, I told you about some of the situations of the japanese turtle wax bugs found in our apple orchards here, and today I will share with you another pest - green blind bugs. Green blind bug is not like the Japanese turtle wax bug, we fruit farmers are more familiar with this name, the harm to apple trees is relatively large, is a pest that we should focus on in our daily management. But we can rarely see them in daily management, especially the wintering eggs of green blind bugs, it is even less difficult to see, which is due to the characteristics of green blind bugs, let's take a look at this pest with you, find out where their wintering eggs are hidden in the winter.
<h1 class="pgc-h-arrow-right" > first learn about green blind bugs</h1>
The green blind bug was originally mainly harmful to crops such as cotton, and its traces can be found throughout the country. It turns out that for apple trees, it is not the main harm, but in recent years, its harm has become more and more serious, and even has the trend of outbreaks year after year, which has become a pest that we focus on preventing and controlling on apple trees.
Green blind bug, from this name we can roughly understand its morphological characteristics, the appearance is green, the body size is relatively small, generally adult worm length in about 5 mm, egg length of about 1 mm, yellow-green, long pocket type. The specific morphological characteristics data are described as follows:
Adults are 5 mm long and 2.2 mm wide, green, densely covered with short hairs. The head is triangular, yellow-green, compound eye black protrusion, no monocular, darker towards the end, 1 section of yellow-green, 4 sections of black brown. The dorsal plate of the forebreast is dark green, with many small black spots and a wide leading edge. Nymphs are 5 years old and similar to adults. Incubated green, compound eyes pink. 2 years old yellow-brown, 3 years old wing buds, 4 years old more than the lth abdominal segment, 2, 3, 4 years old antennal ends and foot tips black brown, after 5 years of age all bright green.
Morphology of adult green blind bugs
Green blind bugs occur in our northern region for 3 to 5 generations a year, overwinter with eggs, and begin to hatch before and after the budding of apple trees in the spring, that is, around the end of March and early April, the hatched nymphs begin to harm apple trees;
Green blind bugs have a certain phototropism, nymph jumping ability is relatively strong, adult insect life is relatively long, more able to fly, after being frightened, whether it is an adult or a nymph, will quickly escape, they are generally lurking during the day, early morning and night out of harm. They are small, protective, day and night, and run when frightened, so we rarely see them by our growers;
After the adult insect feathering of the green blind bug, about a week or so began to lay eggs, the spawning period can be as long as a month, the harm of the first and second generations of green blind bugs lasted from the budding of apples to around the middle of June, the 3rd, 4th and 5th generations of harm peaked in July, August, and september respectively, the next three generations of apples have finished bagging, the spring shoots have stopped growing, their favorite young leaves and young fruits are basically gone, many will be transferred to weeds and other plants, wait until before winter and then come back to lay eggs for wintering. Therefore, the last three generations of green blind bugs are less harmful to apple trees, focusing on the prevention and control of the 1st and 2nd generations, and in recent years, there have also been cases of green blind bugs drilling into the fruit bag, mainly appearing on apples that are not tied tightly when bagging.
There are now cases of green blind bugs entering the fruit bag through the untied bag mouth to harm young fruits
Both nymphs and adults of the green blind bug can harm the apple tree, their mouthparts are prickly suction, especially like the young parts of the apple tree, young leaves, flowers, young fruits, young shoots are their targets.
After endangering the leaves, a small dot will appear first, and then this small dot will fade green and perforate; after the harm of the apple blossom, there will be some red dots on the petals, which will cause the flowers to fall early and cannot sit still; after the harm of young fruits, the place where the fruit surface is sucked will appear uneven, and the flesh will be bolized; after the harm of the young shoots, it can cause the young shoots to twist, and the serious will cause the young shoots to stop growing.
Green blind bugs harm the young shoots of apple trees
< h1 class= "pgc-h-arrow-right" > a survey of wintering in green blind bugs</h1>
In the previous article, when introducing the Japanese turtle wax beetle, I said that due to the restrictions of conditions this year, I only investigated about fifty orchards in the south of Zhaoyuan, which cannot represent the whole situation, but can only be used as a reference for fruit growers.
I consulted a lot of information, almost all of which are green blind bugs in apple orchards, wintering eggs overwinter in the trunk of apple trees, broken branches and ground weeds, but it is better to believe than not to have books, after investigation, we have many of the wintering eggs of green blind bugs here in the flower buds and tips of apples.
This is a little strange, when I first found out, there are also some doubts, consulted a lot of information, are said that the green blind bug overwintering eggs are mainly in the cracks and broken branches of the old warp, but after actual observation, it proves that the data is not so accurate in our place, let's take a look at the following picture, these apple buds have green blind bug eggs inside.
The eggs of green blind bugs photographed in our orchard on apple branches and buds
In these orchards I investigated, basically in these orchards can find the eggs of green blind bugs, the distribution is not regular, the top flower buds, axillary buds and the tips of the branches are there, in the orchard is not very dense, but there are few cases that can not be found, that is to say, this year in our winter here the green blind bugs are still a lot, to pay attention to it.
The eggs of the green blind bug are very small, sometimes covered by flower buds or scales of the tip, it is not easy to find, we can carefully observe the flower buds in the case of good light, if you find that the flower buds or the tip has yellow dots on the head, similar to some small lines, there will occasionally be a shiny situation against the sun, as shown in the following figure, such a situation is basically the same. On closer inspection, the eggs are oblong, and if you zoom in, they look a bit like bananas.
The egg of the green blind bug on the bud of the apple tree looks like a small yellow dot from a distance
<h1 class= "pgc-h-arrow-right" > how to control green blind bugs</h1>
Now we are pruning the fruit trees, some have been pruned soon after the end of the garden, in the pruning and clearing the garden, we can carefully observe, if found green blind bug eggs can be removed in time, but this method can only be used as an auxiliary measure, no one can be a flower bud to observe carefully;
If possible, using the phototropism of green blind bugs, booby traps with black light when the first and second generations of green blind bugs occur, this can be carried out after the emergence of adult worms after May, and can also be used as an auxiliary measure;
In recent years, green blind bugs have entered the fruit bag harm, in the apple bag, be sure to tie the bag mouth tightly, to avoid the entry of pests.
Looking at the eggs of green blind bugs on apple branches from a distance, it is difficult to find
If we say that after observation, there are more green blind bug eggs in the orchard, it is recommended that when clearing the garden, scrape the bark carefully, clean the ground, and there are more flower buds, which does not mean that there are no places in these places. Then the stem branches of the apple tree sprout are medicated with 45% chlorpyrifos 800 times liquid for a comprehensive spray under the tree, you can add a certain silicone additive to enhance permeability, or add mineral oil additives can also be added.
The first two times of the dew red medicine before flowering and the first two times of three times of medicine after flowering are the key to the prevention and control of green blind bugs, and the commonly used agents are high-efficiency cypermethrin, flufenamitrile, acetamiprid, etc., which can be combined with other diseases and insect pests for control.
There are many natural enemies of green blind bugs, such as egg parasitic wasps, flower bugs, grass bugs, cockroaches, spiders, etc., we must pay attention to protecting the natural enemies of these pests while controlling pests, this point has been repeated many times in the past, we fruit growers should also be familiar with it, I will not repeat it here.
<h1 class="pgc-h-arrow-right" > summary</h1>
In recent years, the harm of green blind bugs on apple trees has become more and more serious, this year according to my observation, in our place the number of green blind bugs overwintering eggs is very large, fruit farmer friends can carefully observe the situation of green blind bugs in their own orchards, according to the number of wintering eggs to predict the degree of harm of green blind bugs, timely measures to do a good job in prevention.
The above is just a personal point of view, the level is limited inevitably there are deficiencies, welcome to leave a message to criticize and correct!