What pesticides do chestnut fruit drill insects use?

There are two main types of chestnut borer pests, one is the chestnut weevil; The other is the peach borer.

They are both chestnut eaters, but they are clearly different in form and living habits.

Plate weevil, belonging to the Coleoptera weevilaceae insects, in addition to chestnuts, but also harm hairy chestnuts, wild chestnuts, oaks, etc., living habits for 2 years, larval chestnut milky white wrinkles, gnawing chestnut fruit, there are insect tracts in the fruit, and insect feces are discharged in the fruit tract. In November 10, the larvae are old and ripe and shed their fruits into the soil for overwintering, and overwinter in the soil layer of 10 15 cm. In August of the following year, the adults are unearthed, first feed to supplement nutrition, and then mate to lay eggs.

When laying eggs, the adult first bites a small hole in the chestnut fruit and lays the eggs in the hole, and the oviposition hole on the peel gradually heals into dark dots as the fruit grows. It hatches inside the fruit as larvae to nibble on chestnut fruits.

Peach borer is an insect of the lepidopteran moth family, and its host is not only chestnut, but also harmful to various crops such as peaches, plums, apricots, pears, and apples. In our region, four generations occur a year, and the mature larvae overwinter in chestnut storage depots, bark cracks, chestnut fruit and corn field remains. Adults emerge at night, have strong phototaxis, and lay eggs at night.

Spawning on chestnut bracts, 9 October chestnut before harvesting, most of the larvae eat the bulb bracts, a small part of the fruit, feces are discharged outside the fruit, there is a habit of turning the fruit harm, during the post-harvest stacking, due to the loss of water and the increase in temperature of the bulb bracts, the larvae are transferred to the fruit whose peel has not hardened. At this time, the larvae eat a lot and are the main period of damage to chestnuts.

The morphology and living habits of chestnut weevil and peach borer are quite different, but in production, scientific control methods can be formulated according to their characteristics to achieve the effect of concurrent treatment.

Since the hosts of chestnut weevil and peach borer are hairy chestnut, wild chestnut, hemp oak, corn, sunflower seeds, etc., these trees and crops are the pest of chestnut orchards. Therefore, in autumn and winter, combined with tending management, the land is deeply ploughed, wild chestnut and oak and other plants in the chestnut orchard are cleaned up, and the insect source is reduced by concentrated burning.

The larvae of the chestnut weevil undergo overwintering, pupation, and finally emerge into adults in July and August every year, and before the adults emerge, they can be sprayed on the ground with "phosphine" or "Nongsli" to kill the ununearthed adults.

Of course, it depends on the hazard situation, if the species is very strong, chemical control is generally used, but conventional pesticides (avi, chlorpyrifos and other organophosphorus, cyanuride, carbamate) are difficult to have excellent effects, one is low mortality, and the other is that the effective period is too short; If you miss the control period, the harm to the middle and late stages will be very serious, and it has a cumulative effect, and the harm to the next year will be more serious, and it is necessary to choose (efficient, safe and environmentally friendly pesticides), we can do the test and then evaluate.

The pesticide selection of chestnut root species can be used with 600 times of 30% pine borer emulsifiable concentrate, which is effective for eggs, larvae and adults of all ages, and it is safer to spray this agent 20 days before fruit picking. or deltamethrin 3000 4000 times liquid, or 40% dimethoate EC 800 1000 times liquid.

Black light + sweet and sour solution can also be set up in the chestnut orchard, and the black light and sweet and sour solution can be used to trap and kill adults, effectively reducing the effective egg quantity of female adults.

Hello! From August to early September, peach borer.

The second and third generations of eggs lay eggs on the chestnut shed, and the larvae are mainly harmful to the shed skin after hatching, and only a few old larvae are bored into the chestnut drupes, but after harvesting, the shed bark is cracked in the process of accumulation, and some larvae of Dachashen are harmful to the fruit.

Prevention and control measures: 1. Within 5 or 6 days after the chestnut shed is recovered, the chestnut fruit is taken out of the shell and not dug in time to reduce the harm.

2. During the harvest and accumulation period, spray 25 chlorpyramide No. 3 suspension 2000 3000 times liquid. If the damage rate is less than 1%, there is no need to spray.