Pear fruit weevil eats the young buds and bites the pear fruit, which has a greater impact, how to p

Morphological characteristics of the leopard beetle. Adults are 12-14 mm long on average, dark copper-colored, with a slightly spherical prothorax and dense spots and short hairs. There are three grooves in the middle and dorsal parts, slightly presented"Small"Glyph.

The feet are well developed, and the middle foot is slightly shorter than the front and rear feet. Oval oval, millimeters long, smooth surface, colostale-white, gradually creamy-yellow.

The average body length of the <> larvae is 12 mm, ivory, the surface is mostly transversely wrinkled, slightly curved forward, the head is small, mostly retracted into the thorax, the front half of the head and mouth is dark brown, the back half is tan, each segment has 1 transverse groove, each segment is divided into two halves, the back half has 1 row of brown bristles, the arrangement is not very neat, and the thorax and feet are vestigial. Pupae 9 mm long, colostrum white, new shoots yellowish-brown to dark brown, similar in appearance to adults, with fine hairs on the body surface.

Both adults and larvae of the pear tree weevil damage trees. Adults eat young shoots, whistle peels, and pulp, resulting in rough fruit surfaces, commonly known as them"Pockmarked pear"and bite the stalk of the spawning fruit before spawning, resulting in fruit drop, which seriously affects the yield of pears; The larvae eat in the fruit, so that the damaged fruit is shriveled or the fruit is uneven and deformed, which has a great impact on the commerciality of the pear fruit, so it is necessary to take control measures. In common pear-producing areas, most pear weevils occur in 1 generation per year to overwinter in the pupal chamber as adults.

A small number of individuals have a generation every two years. They overwinter as larvae in the first year and emerge in the summer and autumn of the second year, continuing to overwinter without being discovered. Overwintering adults emerge when the pear tree is in bloom and most when the pear tree fruit is thumb large.

The excavation time is very long. In North China, the excavation time is from late April to early July, with the peak period from May to mid-June.

The number of adults unearthed is related to the amount of rainfall at that time. In the event of a spring drought, the number of excavations will be less and the time will be delayed. Adults fly to trees after emergence, and are mainly active during the day, especially around noon or when the temperature is high and the wind is calm.

After 1 2 weeks of infestation, the adult worm begins to mate and lay eggs, first biting the base of the stalk when laying eggs, then turning to the fruit to bite out a small hole, producing 1 2 eggs in it, and then secreting mucus to seal it, and the oviposition is black-brown spots.

You can buy some insect repellents, spray them regularly, pay attention to strengthening photosynthesis, choose the right pesticides, and water them regularly to ensure the growth of plants.

It is necessary to concentrate on the problematic fruits, burn them intensively, and then prune the branches and leaves regularly, and insecticides can be used.

If there is a problem with this kind of pests and diseases, then I think you have to go to the pesticide store to buy pesticides and call them, so that you can control them.

(1) Physical control: shallow tillage in autumn and winter to kill adults and larvae overwintering in the soil; Using the feigned death of the adults, the adults are collected by shaking the tree and destroyed in a centralized manner. Pick up the insect fruit in time to prevent the larvae from falling off the fruit into the soil.

2) Ground application: In the pear orchard where serious occurrence, ground application under the canopy is carried out at the stage when the adult worms are unearthed. The adult worms should be applied at the beginning of their expulsion, and then applied once after 10 days.

Pesticide type and dosage: 25% phosphine 100 times solution, 5 kg of liquid medicine per plant; add 25 kg of fine sand to 1kg of trichlorfon powder, mix well and sprinkle under the canopy; 90% trichlorfon 100 times solution, 1 kg of potion per plant.

3) Spraying on trees: Due to the long occurrence period of pear weevil, it should be used continuously for 2 3 times. The first application is to spray 80% trichlorfon 800 times or deltamethrin 3000 4000 times before the adults have laid eggs.

Later, depending on the severity of the occurrence, the drug should be reused at an interval of 10 to 15 days.

The main pests of pear fruit borer are pear heartworm, pear cloud-winged spotted borer (also known as pear heartworm), and peach fruit borer (also known as peach heartworm). The prevention and control methods are:

1) Artificial control In pear orchards where the occurrence of borer pests in pear fruits is slight, the insect fruits should be removed in time before the larvae are removed, once every 7 10 days, which can significantly reduce the source of overwintering insects.

2) Pesticide prevention and control of ground poisonous soil: when it is found that the larvae are unearthed, and more larvae are unearthed in a row, the ground control under the tree is immediately carried out. You can choose 25% phosphine microcapsules, with a dosage of kilograms per mu, diluted into 300 times of liquid, and evenly sprayed in each tree tray.

For example, in the pear orchard where the insect occurred heavily in the previous year, spray it once every 15 days. The application range should be beyond the canopy meter. Hoe weeds in the tray before application.

Mountain pear orchards, terraced wall cracks should also be sprayed. Spraying on trees. Pear tree varieties should be distinguished, based on whether the newly hatched larvae can borer into the pear fruit.

When the egg rate of pear borer pests on the fruit is 1%, the first pesticide control is carried out immediately. You can choose 20% deltamethrin (fenatri) EC 3000 times, cyhalothrin (gongfu) EC 2000 times, 20% fenvalerate EC 2000 times, 5% cypermethrin EC 2000 times liquid.

1) Pharmaceutical prevention and control.

In orchards with serious perennial insect infestation, after the overwintering adults are unearthed, especially after rain, spray 300 400 times of 50% octathion EC under the canopy, 2000 times of 10% cypermethrin EC on the tree, and spray 1 time every 10 15 days.

2) Artificial control.

Using the habit of feigned death of adults in Mingshan, Xinghuai excitedly spread sheets or plastic films under the trees in the early morning to hunt and kill the adults who were shaken down. This method should be carried out intensively before the adult copulation and oviposition and when the adult emerges after rain.