What about green vegetables with dense worms?

Green vegetable is a kind of vegetable that we often eat in our daily life. It is cultivated in the north and south provinces of China, especially in the Yangtze River Basin. Green vegetables are very rich in nutritional value, often eating green vegetables can reduce blood lipids, wide bowels, detoxification and detumescence. A green vegetable needs to go through a lot of wind and rain in the process of growing, so what should be done when the green vegetables are infested with insects?

1. Main insect pests of Chinese cabbage and their control methods

The main pests harmful to green vegetables are aphids, diamondback moth, cabbage moth, cabbage borer, flea and so on. There are two kinds of aphids harmful to green vegetables: Rhopalosiphum aphids and peach aphids. The adult aphids and nymphs of the two kinds of vegetable aphids suck vegetable juice, which makes the leaves curl and yellow, the plants dwarf, and can spread virus diseases. It can be sprayed with 1500 times of 40% dimethoate emulsion or 4.5% of 3000 times of cypermethrin or 1500 times of Kezhibao produced by Ruide in Shenzhen.

Plutella xylostella larva, commonly known as "tip at both ends", is another major pest against cabbage. The first instar larvae sneaked into the tissues to eat the mesophyll, the second instar began to eat the mesophyll on the back of the leaves, and after the third instar, the leaves were eaten into holes or reticulation. Generally speaking, activities begin when the weather gets warmer at the beginning of spring. It can be sprayed and killed with 800 times of 90% crystal trichlorfon or 25% of 500 times of trichlorfon.

Pieris rapae is also called green worm, and the adult is Cabbage White Butterfly, also known as Pieris rapae. Take the larva as the harmful leaf, eat into holes or missing carvings, and in severe cases, the whole leaf is eaten up, leaving only petioles and veins. Its control method is the same as that of Plutella xylostella.

The larvae of the cabbage borer are commonly known as drillworms. The newly hatched larvae spin silk and form a net in the heart of the seedlings to feed on the heart leaves. After the third instar, they can also drill down from the heart leaves to feed on the stem pith to the root, resulting in root rot. The vegetable seedlings suffered the most when there were 4 leaves in 3Mel. In the process of control, we should first remove the weeds in the field and the residual leaves of withered plants, and kill the pupa cocoon. In the vegetable seedling stage, that is, before the larvae spin and agglomerate, spray with 90% crystal trichlorfon 800 times solution or 25% Chinese medicine Meiling 1500 times liquid 2000 times.

Both adults and larvae of fleas can produce damage. Adults mainly feed on leaves and can also damage tender stems, buds and pods. The larvae peel off the root bark or decay into the root bark or into the root to form a tunnel, causing the plant to wither. It is necessary to remove weeds and withered plants from leaves in the field after autumn and eliminate overwintering adults. When weeds grow in early spring, they should also be cleared in time, so that overwintering adults have no proper food. When adults are found, they are immediately sprayed and killed with 1500-2000 times of 90% crystal trichlorfon or 25% of Zhong Ke Meiling. The larvae can be killed by spraying the above chemicals on the soil surface.

How to choose green vegetables

Green vegetables are very tender and are most likely to lose water and shrink. Once the water is lost and then sprayed, the leaf tip atrophy of mature leaves can not be recovered. So do not buy those whose leaf tips are wilting. Those with water droplets at the edge of the knife indicate the highest freshness. At the same time, don't buy the old ones, the dark ones are old and the light ones are tender. The petiole that is long in the growing period is also long, generally speaking, it is good to be short.