The Latest Control Methods for Major Corn Diseases

In daily life, corn is a grain we can eat almost every day. Many people's hometowns grow corn, and apart from eating it themselves, most of the corn is sold. The income from growing corn is also quite good, but in recent years corn diseases have been increasing. So below, Shuanshuai will introduce some common corn diseases and teach everyone how to prevent and control them. Let's take a look together!

I. Northern corn leaf blight

1. Symptoms

This disease mainly harms the leaf portion of corn. If the condition is severe, it can infect the leaf sheath and husk leaves of corn. At the very beginning of this virus, it mainly starts infecting from the lower leaves of the plant, then spreads from bottom to top. Finally, all the leaves turn brown, the surface begins to grow mold, and eventually the leaves necrose. The incidence rate of summer corn is generally more severe than that of spring corn.

2. Control methods

Select disease-resistant improved varieties. When corn is first planted, appropriately increase its planting density, then apply more organic fertilizer and phosphorus-potassium fertilizer. In the early stage of northern corn leaf blight, chemical agents can be used for treatment, such as carbendazim, Tuzet solution or thiophanate-methyl solution, spraying about 50-70 kg per mu, once every week, with two to three treatments in total.

II. Southern corn leaf blight

1. Symptoms

Southern corn leaf blight occurs over a relatively wide time range and can infect the plant during both the seedling stage and the later stage of corn. It also generally starts infecting from the lower leaves of corn, then slowly spreads upward. As time goes on, the lesions expand into a yellow-brown spindle shape, and in the later stage the leaves wither and die. If the ambient air is too humid, black fuzzy growth will appear. Its pathogen generally overwinters as mycelium parasitizing the remains of diseased plants, but its survival rate is not high. Places with more rainfall and poor soil fertility are prone to the disease.

2. Control methods

Select highly disease-resistant improved varieties, strengthen field planting management, apply more organic fertilizer, strengthen field drainage, and improve the plant's disease resistance. Chemical agents can be used for control, such as carbendazim and thiophanate-methyl wettable powder or mancozeb solution, spraying 50-70 kg per mu, once a week, for 3 consecutive times to alleviate the symptoms.

III. Corn round spot

1. Symptoms

The part harmed by corn round spot is the ear. It may also harm the husk leaves, leaves and leaf sheath. This pathogen can cause the ear to rot, and the lesions slowly spread and multiply. The symptoms on the ear are the most severe, and sometimes cause the ear to wither and die. The mycelium of this pathogen falls on the straw in the field and overwinters as a parasite, and by the next year it can invade another round.

2. Control measures

Strengthen observation of corn and spray more medication. Fenaminosulf can be used for control. The main spraying area is on the ear, as the ear is the part with the highest incidence of disease,

The above are the main control methods for major corn diseases. The main corn diseases are the three above. Others are seen less often and their incidence rates are not as high, but we should also pay attention to them. Usually, we can spray more corresponding fungicides for control, which can play a preventive role.