Speaking of this black star wheat moth, probably a lot of fruit planting knows that the black star wheat moth is also a pest specifically for fruit occurrence, especially like apples, pears, peaches, apricots, cherries, etc., are the target of the black star wheat moth, from the point of view of the incidence and degree of infringement, some of the stone fruits and nuts are the most seriously affected, and now it is also the festival of Lichun, the weather is also becoming warm, the cherry tree is about to smoke new shoots, especially the cherries in the greenhouse belong to the early maturing varieties, Then this is the time when the Black Star wheat moth is infested, so the majority of growers need to prevent this pest in advance and be foolproof, so as to reduce unnecessary losses.
In recent years, due to a lot of fruit growers, the fruit trees do not pay much attention to, resulting in management is more extensive, some fruit trees are also to a certain age, there is no timely elimination, so many orchards as long as there is an old tree park, basically the probability of occurrence of black star wheat moth is more than 90%, followed by the young trees in the orchard is also a major cause of insect infestation. In the past, because this insect pest is almost very small, so the growers do not pay much attention, when the orchard black star wheat moth occurs, many fruit trees are in a state of explosion, a black star wheat moth will form a nest on the fruit tree leaves, each nest will appear 5-10 larvae, sometimes a nest of small insects can reach 20-30 at most, so the black star wheat moth should not be underestimated.
< h1 class= "pgc-h-arrow-right" > first talk about the morphology of this black star wheat moth in order to recognize it</h1>
Black star wheat moth is a lepidoptera, pest of the wheat moth family, black star wheat moth is also called black star curly leaf bud moth, from the name you can see that this black star wheat moth mainly invades the leaves of fruit trees, especially likes to nibble on the leaves of cherry trees, followed by other fruit trees, the damaged leaves will be rolled into a roll, and then nibble on the leaf flesh of the leaves, sometimes the leaves will be eaten only the leaf veins and epidermis, forming a dry yellow nest, nibbling on serious fruit trees are far away to see a piece of dry yellow, Sometimes cherry trees eaten by the black star wheat moth will cause the fruit tree to germinate young shoots for the second time, causing the fruit tree to grow too vigorously and lose its resistance. The following is the form of the black star wheat moth, which is mainly composed of four forms: adult, larva, egg and pupa.
Adult: Adults are about 6-7 mm long, about 18 mm when flying, the color of the body and hindwings is gray-brown, the back of the thorax and forewings are dark brown, the forewings are rectangular, and there is a pale yellow marking near the front part 1/3, with a certain brightness, and there are two inconspicuous black spots in the middle of the wings.
Larvae: The body length of the larva is about 10-12 mm, slender, the dorsal plate of the head and thorax is dark black, the hind tail is brown, and there are six purple-brown stripes on the body, with white between the stripes.
Pupae: The pupa is about 6 mm long, the pupae's body is dark brown, and there are bright yellow juxtaposed spikes at the posterior edge of the ventral segment, which generally have two spikes in the seventh segment of the pupal body and the ventral segment of the sixth segment.
Eggs: The eggs are oval in shape, about 0.6-0.8 mm in length, and bright yellow.
<h1 class="pgc-h-arrow-right" > how does the Black Star Wheat Moth invade cherry trees and their habits? </h1>
Black star wheat moth in many areas of our country have occurred, especially the northern fruit trees are most likely to provoke the black star wheat moth, but from the perspective of recent years, the southern region also has a trend of development, the current black star wheat moth invades the bayberry, mango and other fruits are also frequently invaded, from the degree of infringement there are signs of rising, so for fruit growers in the southern region also need to pay attention to strengthen management. Let's first understand the invasion and habits of the Black Star Wheat Moth.
Black star wheat moth in most areas is three generations a year, and some areas will occur four generations, black star wheat moth pupae will generally be in the orchard weeds, and orchard soil, and some pupa will parasitize in the bark of some old fruit trees for wintering, and some pupals will be hidden in the leaf mezzanine without falling, for cherries planted in the open field, generally will germinate around March, this time there will be pupa feathers after adult insects, adults will begin to interpat and spawn in the orchard after about 10 days. The larvae then emerge from the egg shell and invade the newly sprouted young leaves, causing early damage to the cherry.
For the invasion of the black star wheat moth, if the temperature is suitable, then it will appear in the greenhouse greenhouse, the so-called fruit tree growth environment, but also suitable for the black star wheat moth to appear in the temperature, the black star wheat moth lays eggs, generally will lay eggs at the base of the leaf petiole of the cherry tree, generally when laying eggs can lay 5-10 eggs, some will lay a single egg, the larva hatched from the egg will gather together to invade the leaves of the cherry tree, there are few larvae that act alone, as we said earlier, When there is a long time, a nest of small insects can reach 20-30 for harm, and soon the young shoots and leaves will be eaten clean, resulting in a bare piece of cherry tree.
The larvae of the black star wheat moth are very sensitive to the outside world, if they are frightened, the larvae of the black star wheat moth will quickly spit out white silk, and then the larva will run under the leaves with the silk, generally the first generation of larvae begins to appear in March and April, the second generation of black star wheat moth appears in May and June, the third generation appears in July and September, generally in the third generation, the larvae will run to the weed pile under the cherry tree to pupate and begin to hibernate, followed by parasitism in the soil cracks and bark.
For cherry trees that are invaded by the black star wheat moth, the general fruit tree appears with filaments, and some leaves will appear on the filaments, these manifestations are the black star wheat moth, some cherry tree leaves are eaten, the leaves only appear leaf veins, similar to the network, is more obvious. Sometimes after the formation of insect buds on the leaves, when we peel off the insect buds, the larvae will form an insect channel in the multi-layered superimposed leaf, and the larvae can freely advance and retreat in the insect channel, which is more cunning. In addition to the leaves are invaded by the black star wheat moth at the same time, the black star wheat moth will also infringe on the branch tissue of the fruit tree, sometimes, the fruit tree wound that has been invaded by the black star wheat moth has formed a secondary invasion target, sometimes, when the grower peels the fruit tree in the ring, it will find that some fruit tree branches appear on the surface of the patchy pothole, that is, the black star wheat moth as a behavior, the larvae of the black star wheat moth are mainly invaded by the fruit tree during the day, and the adult insects are active at night and are more sensitive to the light.
< h1 class="pgc-h-arrow-right" > how can we effectively control the Black Star Wheat Moth? </h1>
1, timely strengthen the elimination of the old trees in the orchard, in some orchards, many old fruit trees have become the main target of insect pests, so for some of the old fruit trees in the orchards to be resolutely eliminated, followed by some young trees to be planted separately, should not be planted together with the old trees in the park, at the same time in the early stage of planting cherry trees, must not be mixed planting, to avoid the mixed planting of fruit trees of the stone fruit and kernel fruits, the planting of cherry trees alone should choose varieties with high disease resistance and strong insect resistance to reduce the occurrence of insect pests.
2, after harvesting the orchard, to clean up in time, turn over the tree tray and take the orchard for cleaning. For the fruit trees found to be infested by insects after harvesting, it is necessary to scrape the bark on the fruit tree wound in time, clean out the insect buds and insect cocoons, avoid the pests from successfully passing the winter, the wound of the fruit trees that are infested by pests should be applied in time after harvesting, and the stone sulfur compound or Bordeaux liquid should be applied in time, (note that these two drugs cannot be used at the same time, you can use a drug alone) After harvesting in the park, the soil should be deeply ploughed once, pay attention to the autumn application of base fertilizer, it is best to apply the soil of the orchard for a deep ploughing in the autumn, Clear out the weeds and other debris in the park, use fire to burn centrally, and then the soil is best exposed, it is best to spray the soil once with insects or enemy emulsion to kill the remaining insect pupae, and then when the base fertilizer is applied in autumn, the insecticide and fertilizer are used together into the soil to kill insects.
3, artificially picking the eggs of pests, in the cherry park, when it comes to pumping new shoots and young leaves, adults will appear, then adults are mostly laying eggs in the orchard, most of them start laying eggs on the back of the leaves, we can manually pick eggs, when there are eggs on the back, the grower manually picks them, puts them into special bags, and then takes them out of the park to burn, when the larvae invade the fruit trees, we can carry out the inspection of the park, and find that the insect bud density of the fruit trees is not large. Generally, if each tree has less than 20 buds, it can be manually picked, and the buds on the leaves can be cut off with scissors, and then uniformly treated.
4, reasonable use of the natural enemies of the orchard to prey on the eggs of the black star wheat moth for insect extermination, like the long aphids that appear in the orchard, six-spotted aphids, big-eyed cicadas and other insects should be protected, followed by the use of wheat moth cocoon bees high parasitic rate characteristics, to prey on the eggs and larvae of the black star wheat moth, thereby reducing the occurrence of insect pests, while for adult insects have phototropic properties, we can use black light to kill the adults of the black star wheat moth, if the park black star wheat moth natural enemies are few, It is also possible to use the frequency vibration insecticidal lamp to kill the Black Star wheat moth, which has a better effect.
5, the rational use of chemical drugs to kill the black star wheat moth, our focus must be placed on the first generation of pests for treatment, because, the occurrence of the first generation of black star wheat moth adults is more uniform and neat, so in the late stage of adult spawning and the early stage of larval hatching treatment is the best time, for the occurrence of insect infestation orchards, you can use cypermethrin emulsion, cypermethrin emulsion, bifensin emulsion, dimethodate emulsion, cypermethrin emulsion, oxidized legos emulsion, Uranus emulsion, It is also possible to use quick-killing butter emulsion and sesame oil to mix well, and it has a better effect to kill adult insects in the field. For the early stage of cherry trees in the extraction of new shoots suffered from the invasion of black star wheat moth, in addition to spraying drugs, in order to inhibit the late autumn shoots of cherry trees, 600 times the enumazole can be used, which can reduce the nutrient consumption of cherry trees, which can promote the differentiation of flower buds of fruit trees and improve the quality of cherry tree flower buds.
Note: The above drugs in use, focus on the cherry tree with insect buds spraying, for the larvae of the black star wheat moth is more cunning, we can use the drug spraying, when spraying, you can manually shake the fruit tree, the larvae are frightened, will quickly spit out the silk drooping, and then we spray again, the treatment effect can reach more than 95%, it is recommended to use this method.