Recently, some friends have reported that this year's pear-tree hibiscus is very serious. It has not been able to go down with a few medicines. How is this going to happen? Will it be possible to achieve good results next year?
First, retransmission reasons
1. Last year's warm winter: This is beneficial to the safe wintering of P. crassifolia adult, which makes the base number of insects relatively increase.
2. Ideas to relax: Relax the management of the removal of fallen leaves from the dormant period of fruit trees, and the removal of barks and insects.
3. Enhancement of resistance: In recent years, in addition to the treatment of pear medlar, the avermectin concentrate with excellent effect on the treatment of pear hibiscus has been used for a long time, without alternation, excessive, continuous, repeated use. Therefore, it has gradually become more and more resistant to the “one-size-only†abamectin EC.
4. Do not help the good "Heavenly God": The weather in May to June this year is relatively dry, little rain, but also created a more favorable conditions for the occurrence of the severe occurrence of pear hibiscus.
Second, the characteristics of occurrence
Pyralidae, Homoptera, Polygonaceae, pear production areas are distributed, especially in northern China and other fruit areas are more severe victims. It took 4-6 generations a year in our province to overwinter in adult barks under tree gaps, tree holes and fallen leaves. Adults and nymphs are all clustered on young leaves, fruit stems and shoots. They suck sap. When the early spring buds start to sprout, the adults begin to lick, sucking on the shoots and secreting white wax, and then copulating and spawning. The spawning volume increased rapidly during the expansion, the budding period was the spawning period, the flowering period was the first generation egg hatching period, and the post-flowering stage was the nymph stage. Nymphs like to harm at the base of the petiole and leaf plexus, within the leaflets, at the sticking point of the leaf buds, within the fruit bag, and on the back of the more obstructed orchard leaf and other shades. After the leaves are damaged, the green patches are lost, curling, yellowing, and early falling. The damage to the flower buds will affect the opening, yellowing, littering, fruit damage, rough fruit surface, affecting development, coal pollution, and leaf and fruit contamination. Normally, the last generation occurs after the fruit is harvested from September to October, and the nymphs feed on the shoots at -2°C in mid-December. Adults at about 0°C (February 10) are moths. After 1 to 2 days after hatching, the nymphs can secrete colorless, transparent waxy waxes and a colorless, transparent, viscous liquid that adheres around them. After the increase of mucus, the nymphs will be embedded. When the nymphs molt, they will crawl out of the mucus and continue to produce secretions after the molting. The secretions will accumulate to a certain extent and then drip from the leaves to the lower leaves, fruits or the ground.
Third, prevention and control measures
1. Spend 5 Baume degrees of lime sulfur or 20 to 30 times of crystal lime sulfur before germination to kill insects and eggs.
2. Agent spray control:
(1) Timely spraying after spraying, "Dai Li Ping" Brand 25% Tianwei Awei Danjia water dispersible granules 1000 ~ 1300 times liquid, can kill eggs and nymphs, the effective period of up to a month or so.
(2) When there is no mucus or a small amount of mucus on the leaves, 5% avermectin EC may be used 1500-3000 times the liquid + plus more than 10,000 to 3000 times.
(3) In the case of more mucus on the leaves and especially serious pests, 25% of Tianwei Aweidanjia water dispersible granules can be used to disperse granules 1000 to 1300 times and 5% avermectin 1500 to 3000 times (or Add more than 1500-3000 times liquid additives, high efficiency and no phytotoxicity.
API Powder is fully defined in ICH Q7A as any substance or mixture of substances intended for use in the manufacture of pharmaceutical products and, when used in pharmaceutical products, as an active ingredient of pharmaceutical products. Such substances have pharmacological activities or other direct effects in the diagnosis, treatment, symptom relief, management or prevention of disease, or can affect the function or structure of the body. The active ingredient of a medicine. Only when an API is processed into a pharmaceutical preparation can it become a medicine for clinical application.
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