Pine cattle are the main dry moth pests that harm pine trees, and their adults supplement nutrients and nibble on the skins of young branches, resulting in the weakening of the host; The larvae burrow into the trunk of the tree, causing the pine tree to die. What is more serious is that the tianniu is a vector insect that transmits the devastating disease of pine trees - pine wood nematode disease, and an adult pine cattle can carry up to tens of thousands of pine wood nematodes, which is listed as an international and domestic quarantine pest. (Pine wood nematode disease is a devastating disease of pine trees.) Once the pine tree is infected, it cannot be treated, and the death rate is fast, and it can die in as soon as 40 days, which is called the "cancer" of the pine tree. ）
Life Habits:
Pine cattle larvae generally overwinter in pits or in tree holes of inlaid pine trees. In late April and early May of the following year, the overwintering larvae pupate pupate in the pupal chamber at the end of the worm passage. Adults feather in early May and peak feathering in July. At this time there are adult worms, pupae, and larvae in the worm passage at the same time. In mid-May, adults bite a round feathered hole out of the tree and feed on the young skins of young branches to supplement nutrition.
Adult pine cattle prefer to lay eggs in sparse, well-lit woodlands. When laying eggs, bite an almost conical egg laying mark on the trunk or branch of a diseased tree or a weak tree, and lay 1 egg per mark, and the egg period is from mid-May to August. After the larva hatches, the moth is infested under the skin, and in the late autumn, the moth is xylem, the worm path is oblong, and the old mature larva bites into a wide pupal chamber at the end of the worm road, and plugs the two ends of the moth with wood chips before pupal, and the pupal period is half a month.
Prevention and control methods:
1. In the adult stage of pine brown cattle, the trunk and crown are sprayed with "green Wei lei" (tactile microencapsules) (300 times liquid), or other insecticides with good astringency and strong downward conductivity, which are controlled at the beginning and peak of feathering of Songtian cattle. In the juvenile larval stage of Songtian cattle, "An'erdan" granules are used to spread the roots of trees.
2. For ancient famous pine trees with special significance and pine trees that need protection, during the feathering period of The Pine Heaven bull, a hole in the trunk base is punched and injected with "insecticidal package combination" for protection.