I remember when I was a child, there were two peach trees in front of my house that had been planted for more than ten years, the height of the tree was more than ten meters, and the crown width was about three or four meters. Every year, two peach trees hang a lot of fruit in the summer, and when the fruit is ripe, it is red and green, and it is delicious to watch. It's delicious, but the only thing that bothers you is that most of the fruit, when we break it open, there will be a lot of reddish-brown worm dung in it, like dumplings stuffed with "bean paste". However, from the outside, there is no insect eye, and it is difficult to know which peach has "stuffing" inside and which one is healthy. Therefore, if we take such a fruit to the market as a fresh fruit, it is estimated that we will be scolded to death.
Before, I didn't know what this situation was, what kind of insects were the result of pests, how to control them, and so on. Later, I learned that this was the so-called harm of the peach heartworm. Peach small heartworm is also called peach small moth, apple heartworm, peach leaf eating moth, etc., mainly for peach trees, pear trees, apples, jujubes and other fruit trees. Generally for peach orchards with better management, the harm of peach small heartworms is rare, and even if there is harm, it is not serious. The peach trees cultivated in front of and behind the houses and the peach orchards with relatively extensive management are the main targets of peach heartworms.
Peach heartworms moth the flesh of the fruit in the larval stage, and after entering the fruit, they potentially string the pulp inside and then eliminate a large amount of feces. Some fruits can not see the symptoms of being harmed after being harmed, while others will have a sunken appearance and deform. If the fruit that is about to ripen is harmed, the shape of the fruit will not change, and it is difficult to see from the appearance whether it has been harmed. However, compared to healthy fruits, this fruit is prone to soft rot and shedding. The reason why it is difficult to see from the outside whether it has been harmed is because the larvae have been eaten for a period of time, and when they are ripe, they will crawl out from the inside, and some pulp will fill the worm's eyes, and some will not.
In addition to harming the fruit, the peach heartworm will also harm the new shoots of the peach tree, and the larvae will re-enter the youngest part of the tip from the outside to the inside, and when it enters the wooden part, it will move in other directions. However, after the tip of the peach tree is mothed, the worm mouth will have glue and insect feces, and then it will break from the moth, and gradually wither and die. Because most of the victims are pointed, it is a bit like being plucked.
Peach small heartworms occur several generations a year, more than 4 generations, less than 2 generations. Generally in the spring, the 1st and 2nd generations occur, because the peach trees are still in the flowering stage, or have just turned fruit, so the objects of harm are mostly young shoots that have just grown. In the 3rd and 4th generations, when the fruit is large enough, the target of harm is mainly the fruit.
In winter, this pest usually overwinters as old mature larvae in the weeds piles, stone crevices, dead branches and leaves of the peach orchard, as well as in the old skin and wounds of the trunk, and the wintering cocoon is most likely near the surface at the base of the trunk. In the spring, when the weather warms up, the pupae begin to pupate, and then feather the adults to lay eggs on the peach trees. When the eggs hatch and become larvae, they begin to be tender, and when the larva matures, they enter the bark of the trunk to make a cocoon pupa. Such a recurrence occurs from generation to generation, and for peach trees, from the growth of new shoots to the ripening of fruit, they will be harmed by their larvae.
So how can this extremely harmful pest be effectively controlled? As with the control of most other pests, orchard management is intensified while targeted eradication is carried out. Specifically, it is necessary to control it through the principle of under the tree prevention and control as the mainstay, supplemented by the prevention and control of the tree, and the combination of artificial and pharmaceutical measures:
A destroys the wintering site. According to its wintering habits, in the winter, the orchard is cleaned up, the weeds and dead branches and leaves in the orchard are cleared, and the diseased insect branches are pruned, the diseased insect fruits of the trees are plucked, the old bark of the trunk is scraped, and then the peach orchard is brought out and burned. This can not only destroy its wintering places, but also kill its overwintering insect cocoons, which can effectively reduce the number of insect populations after the spring heating up.
B. Remove the worm fruit. That is, after the larvae begin to moth fruit, we must remove the worm fruit in time, go to the peach orchard every day to check, find that it is immediately removed, which can also effectively control the number of insect mouths. Or it may be concentrated booby-trapping before its larvae are shed, that is, straw is tied on the main branch or trunk, lured into it, and after a period of time, the straw is removed and burned centrally.
C Trap adults. Booby-trapping adult insects are mainly to hang insect trap lamps, frequency vibration insecticidal lamps, sweet and sour liquor and so on in the peach orchard. In order to reduce the probability of the fruit being harmed, we can carry out bagging after the fruit is set to prevent larvae from entering the fruit.
D Spray Control. Spraying prevention and control needs to be done throughout the park, whether it is on the ground or on the tree, it needs to be sprayed in order to kill the old mature insects that enter the ground as cocoons. However, it is worth noting that spraying is not a green control method, especially during the fruiting period. If you want to spray, it is best to spray the whole park when the first generation occurs, and there is no pesticide residue.