The diagnosis method of vegetable pests can be divided into two categories: First, direct diagnosis method, that is to identify the morphological characteristics of pests in various periods, this method is more intuitive and simple; Second, indirect diagnostic method, that is, through pest remnants or vegetables Victim characteristics to diagnose. Residues of pests include derivatives of pests (such as egg shells, clam shells, peeling, worm body and dead carcasses, etc.) and excretions of pests (such as feces, honeydew substances, silk screens, foamy substances, etc.) ). Symptoms of vegetables can be divided into the following categories: 1, the leaves are fed, forming a nick. These are mostly lepidopteran larvae and coleopteran pests of chewing mouthparts. 2, the leaves on the wire-like stripes or gray, gray and yellow spots. Most of the symptoms are caused by sucking mouthparts, such as leafhoppers or stinkbugs. 3, vegetable seedlings were snapped or cut off. This is mostly what the moth or leaf moth do. 4. Secretion of honeydew induced coal disease. Such insects cause black spots on the surface of vegetables by producing dew-like excrement, and are often dominated by sucking-liquid small insects such as various aphids. 5. The heart is narrowed and thickened. This symptom occurs more often on bell peppers and peppers, which is more related to ticks. 6, pests in the vegetables to carry out harm. The pests generally enter the body of vegetables and are difficult to see from the outside. If fresh insect pests are found on or around the vegetable strains and there are fresh insects on the vegetable strains, it can be judged that the pests are still harmful in the body; sometimes there is excrement With wormholes, but the faeces and wormholes have already dried up, it means that the insects have been transferred to other places. Most of these pests are larvae of moth insects. 7, the upper part of the vegetable seedlings withered and died. The death of the upper withering indicates that the roots of the vegetables have been damaged. This is mostly caused by underground pests such as cockroaches, root clams, and root nematodes. 8. The massive fruit is foraged and rotted. Underground fruits such as potatoes, onions, and garlic are rotted or foraged during their growth and storage, and most of these snails and root lice are found. According to these characteristics to determine pests and take appropriate control measures, we must first rule out the impact of other factors, such as fertilizer or excessive water caused by the upper part of the vegetable seedlings wilting death.
Mustard Paste,Mustard Sauce ,Mustard Chicken ,Honey Mustard Sauce
Condiment & Seasoning Co., Ltd. , http://www.nbsauce.com