When is the ripening season of "natural brain gold" walnuts?

Walnut is rich in nutritional value and is known as "natural brain gold". The ripening period of walnut will change due to different varieties and climate differences, so when is the mature season of walnut?

First, the ripening period of walnut

The ripening period of walnut will change due to different varieties and climatic differences. the maturity of some early-maturing and late-maturing varieties can be 10 to 25 days different. most of the ripening periods in the north are from the first ten days to the middle of September, while those in the south are relatively earlier.

Second, the picking season of walnut

When the walnut is harvested from August 25 to September 1, the walnut kernel is yellowish brown or light brown, which will taste fragrant, but slightly astringent. If the walnut kernel is picked after September 1, the walnut kernel will be white and yellow, with an oily flavor and crisp. If you harvest the walnut later, the maturity will be very high, and the green skin will crack by itself, and it will be easy to remove the green skin at this time. And after peeling, the fruit surface is clean and good-looking.

The treatment methods of green skin include mechanical peeling, heap peeling and chemical peeling. Wash the residue with water in time after peeling, dry and store.

III. Disease and pest control of walnut before and after harvest

1. Diseases: there are mainly walnut black spot, walnut anthracnose, rot and withered branches. The prevention and control methods are as follows.

① found that diseased fruits and leaves were removed in time and taken out of the garden to avoid large-scale outbreaks.

Before flowering, after flowering and young fruit stage (May-June), ② was sprayed with 200 times Bordeaux solution or 500 times 800 times solution of 50% methyl topiramate wettable powder, which could achieve better disease prevention effect.

2. Insect pests: there are mainly walnut limb moth (walnut black), longicorn beetle, bark moth, beetle, diamondback moth, green-tailed silkworm moth, gibberellin and so on. The main control methods are as follows.

Physical control of ①: releasing birds in the garden, trapping and killing adults by black light, artificial capture, etc.

② chemical control: stone sulfur mixture is sprayed before walnut germination to kill overwintering diseases and insects. Before the fruit decay of the larvae in the early spawning stage of the adult walnut moth, the first spraying time was sprayed with 1500 times of 25% cypermethrin 3 and 1000 times of cypermethrin, once every 10 days. During the active stage of the larvae of the bark moth, the cotton was stuffed with dichlorvos into the wormhole to kill the larvae or cut off the branches and burn them. Remove part of the soil from the root neck, inject it into the wormhole with 40% dimethoate emulsion, then seal it with wet soil to kill the larvae.