The Latest Control Methods for Common Bean Pests and Diseases

The common bean, scientific name Phaseolus vulgaris, commonly known as the two-season bean or four-season bean, is a common legume vegetable in our daily lives. When growing common beans, we often encounter some problems. Pests and diseases are a particularly troublesome issue for farmers, as they seriously affect common bean yields and farmers' income. So what are the common pests and diseases of common beans? And how should they be controlled? Let's take a look.

1. Anthracnose

Common bean anthracnose is more severe in rainy seasons. It not only affects yield but also reduces the commercial value of common beans. This disease can be identified throughout the entire growth period and mainly damages stems, leaves and pods. When leaves are affected, brown circular lesions appear; in severe cases the lesions crack or perforate, and eventually the leaves wither and die. When pods are affected, small brown spots appear and gradually spread into circular lesions, and under high humidity a pink sticky substance oozes out.

Control methods: Practice reasonable crop rotation, choose varieties with strong disease resistance, and select disease-free seeds for sowing. Before sowing, seeds can be treated with carbendazim as a seed dressing for disinfection. When the disease occurs, spray thiophanate-methyl and anthracnose-formaldehyde for control.

2. Bacterial blight

Also known as fire blight, it is severe during periods of high temperature and abundant rain. This disease mainly damages stems and vines, leaves, pods and seeds. When seedlings are affected, water-soaked lesions appear on the leaves and gradually turn into reddish-brown canker-like spots; the lesions encircle the stem vine, eventually causing the seedling to break and die. When mature plants are affected, water-soaked dark green lesions appear at the leaf tips or leaf margins and gradually expand into irregular brown lesions; eventually the lesions merge and cause the entire leaf to wither and die.

Control methods: Practice reasonable crop rotation, choose excellent varieties with strong disease resistance, soak seeds with streptomycin sulfate before sowing, then dress seeds with thiram before sowing. When the disease occurs, spray agricultural streptomycin for control, once every 7-10 days, for 2-3 consecutive times, with good results.

3. Sclerotinia rot

Sclerotinia rot mainly damages stems, leaves, pods and branches. It first infects the main stem and leaf axils, where light green lesions appear, then gradually enlarge, and finally form water-soaked lesions. The surface of the lesions is rather slimy, then dries and becomes grayish-brown and white.

Control methods: Practice reasonable crop rotation; it is not advisable to rotate with legume crops, rapeseed, mustard, sunflower and other crops. In the early flowering stage, spray dimethachlon for prevention,

4. Pests

The main pests of common beans include root-knot nematodes, root maggots, slugs, aphids, red spider mites, whiteflies, leafminers, etc. They damage the root system, leaves, stems and vines, and pods of common bean plants. During pest outbreaks, losses range from reduced yield to total crop failure.

Control methods: After harvest, combine garden cleanup with soil plowing to reduce pest sources. Pesticides can also be mixed with fine soil and spread on the soil to kill pests, or spray fosthiazate and metaldehyde granules for control.

The above is an introduction to the pest and disease control methods for common beans. We hope it helps you. For more related knowledge, please stay tuned to us.