Recently, some fruit farmers have telephoned to report that each year in the walnut harvest season, there is a kind of pest known by the locals as a sweeping armor, which is very irritating to human skin. Once the skin is exposed to this bug, it will immediately appear red, itchy, and painful. They asked how to prevent this pest in advance?
The pests reported by farmers are scientifically known as the yellow moth, which is a lepidoptera moth. The yellow thorn moth is also called a moth, an anise, an octagonal jar, a pepper, a wax pot, and white bristles in some places. The larvae are mainly harmful to larvae and are omnivorous leaf-feeding pests. They mainly harm walnuts, pears, jujubes, apples, and other fruit trees, and also cause damage to a variety of trees.
The yellow thorn moth is mostly 1 year old in the north and 1 year and 2 years old in the Yangtze River valley. After the autumn, the mature larvae usually branch off in the branches, and the stems and even the leaves of the larvae are hard to survive. The ellipse-shaped, gray-white, with several brown longitudinal bands resembling quail eggs, early summer, mature larvae larvae in the pupa, one month later the adult eclosion fly out, and the quail even mated to lay eggs. The newly hatched larvae of T. bracteidae tend to live on the leaves that have produced eggs, eat leafy leaves, leave veins, and the affected leaves are reticulated. After 3rd instar, the larvae disperse their activities and encroach on the leaves, resulting in incomplete leaves. In severe cases, the leaves will be eaten away, leaving only the petiole. In winter, it can be judged whether yellow thorns are infested by checking whether there are dark brown stripes on the branches. The yellow instar larvae are yellow, and the older larvae are yellow-green, about 25 mm in length, slightly dilated at both ends of the body, and a large purple-brown spot on the back. The stings on the body of the yellow larvae have a stimulative effect on human skin, which can cause skin irritation, itching, and pain.
There is a certain pattern of damage to the yellow moth, and the annual summer and autumn are the second generation of larvae and the first generation flood season. We must pay attention to prevention and control work in advance.
1. Pick larvae. Before the third instar, the larvae are harmful to many groups and should be removed in time. Because the larvae have poisonous hair, contact with the skin should be avoided.
2. Chemical control. Available 90% crystal trichlorfon 800 times, 80% dichlorvos 1000 times, 5% beta-cypermethrin 1500 times, bio-pesticides Bacillus thuringiensis preparation 10 billion spores per gram of bacteria powder, or Bt emulsion 500 to 600 times liquid, etc. Spray larvae.
3. Artificial scissors. Thorn moth sticks to the stem and can be cut with a pruning shear.
In addition, when farmers work on farmland, they should not scratch if they are carelessly caught by the yellow larvae. This can cause poisonous stings to penetrate the skin. It is recommended to stick out with a medical adhesive plaster or use sterile needles to remove the stings first, then clean the wound with alcohol, and finally apply anti-inflammatory and hormone ointment. If there is swelling and inflammation, go to the hospital.
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