Usually it can be controlled in two key periods: the full flowering period and the end of flowering period. The flowering period of pear can be controlled by 10% polyoxin+10% fipronil +5% high chlorine emamectin benzoate+1500 times+sugar alcohol boron+silicone. At the end of flowering, 10% polyoxin +80% pymetrozine +25% buprofezin+brassinolide+penetrant or 10% polyoxin+pymetrozine +3% avermectin+brassinolide+siloxane can be used for control.
First, the best pesticide for controlling pear psylla
1. Spraying pesticides to control overwintering adults of psylla in Qingyuan area
(1) can be combined with clearing the orchard before pear germination to control adults, and the orchard with heavy pear psylla can generally be comprehensively controlled, and 1.8% octylamine acetate 400 times solution+1000 times solution +25% imidacloprid 1000 times solution+can be used.
(2) Note: When spraying branches, the fallen leaves of weeds on the ground can be sprayed wet together, which can kill some overwintering adults.
2. Spraying pesticides to control the adult psyllid in the white stage of pear.
Exposure period is the peak of overwintering adult emergence, and it is also the key period to control psyllid. The comprehensive control method is 10% polyoxin+10% flupirimicarb +5% high chlorine emamectin benzoate 1500 times solution+sugar alcohol boron+siloxane, which can generally prevent mold heart disease, aphids and psyllid adults.
3. The control of pear psylla by spraying at the end of Xie Hua.
At the end of (1) flower withering, the eggs of psylla pyrifolia generally hatch at the end, when almost all the eggs hatch into nymphs. However, if the body surface of 1 year-old insect is not waxy, it has strong resistance and long exposure time, so this period is also a key period for control.
(2) The comprehensive control methods are 10% polyoxin +80% enkephalin +25% buprofezin+brassinolide+penetrant or 10% polyoxin+spirodiclofen +3% avermectin+brassinolide+siloxane, which can usually prevent mold heart disease and prevent aphids.
(3) Note: For orchards with serious psyllid, it can be sprayed twice every 5-7 days.
4, medication precautions
(1) It is necessary to reasonably use drugs alternately, treat both the symptoms and root causes, reduce the frequency of drug use, comprehensively control several pests, and reduce the resistance of pests to pesticides.
(2) When spraying liquid medicine, carefully and comprehensively control the use concentration.
Second, the occurrence regularity and control techniques of psyllid
1, with regularity
(1) psyllid overwinters in leaves, weeds, crevices and bark in 6-7 generations in 1 in south-central Hebei Province, and generally emerges in February-March. When it comes out in mid-March, it will lay eggs on branches and leaves, and lay eggs in tender tissues during leaf unfolding.
(2) Nymphs of psylla pyrifolia are mostly clustered and have the habit of gum secretion. Its larvae will live, feed and damage in the glue, and the peak of direct damage is usually from May to July. Because of the overlapping generations, the pear psylla can damage all the year round.
(3) When the rainy season comes in July and August, the mucus secreted by psylla will lead to miscellaneous bacteria. When the relative humidity of the environment is greater than 65%, mildew will occur, resulting in brown spots and necrosis of leaves, leading to early defoliation.
2, prevention and control technology
(1) agricultural control
1 In winter, old bark should be scraped off, pests, leaves and weeds in the garden should be thoroughly removed, and the number of overwintering insects should be reduced.
We can make use of the habit of overwintering adults to get into the warped skin for overwintering, tie sacks, old cloth and other items to the trunk and main branches for trapping, and then scald pear psylla or old cloth with boiling water regularly.
(2) Chemical control
Generally, it can be sprayed 1 in mid-February at the peak of overwintering adult emergence, such as 8% avermectin EC 2000-3000 times and 5% avermectin EC 5000 times.
2. It can be sprayed with 2000 times solution of 10% imidacloprid and 2000 times solution of mirex in the first generation nymphae.
Usually, it can be sprayed with 10% imidacloprid 2000 times solution+1.8% avermectin 3000 times solution+Baiphosphorus No.3 1300 times solution +0. 1% washing powder from May to September.