Common pest and disease maps of maize, many types of pests and diseases that damage corn, the main diseases are big spot disease, small spot disease, head smut, bacterial wilt, ear rot and virus disease, and there is a serious damage in some areas. , brown spot disease, rust, round spot disease, gray spot disease, etc.; the main pests are corn borer, ground tiger, armyworm, red spider and so on.
Gray leaf spot of corn, which mainly damages corn leaves, also infects leaf sheath and temporal lobe. In the early stage of the disease, circular, oval red-brown rectangular streaks are formed between the veins. The lesions are mostly confined to the veins and parallel to the veins. When mature, the lesions are gray in the center and brown in the edges. The size is (4-20 mm) × 2-5) mm. When the humidity is high, gray mold is produced on the back of the lesion.
The typical syndrome of corn leaf spot is that it spreads rapidly from small lesions into long-horned large spots, which are severely longer than 10-30 cm. Sometimes several lesions are connected together to form irregular large spots. The lesions were initially flooded and quickly turned into a green color, which eventually turned into black mold, the conidiophores and conidia of the bacteria.
The symptoms of corn leaf blight are characterized by small lesions, generally no more than 1 cm in length, and are limited to between two veins, nearly elliptical, and the edge of the lesion is darker in color and russet. In addition, the number of lesions is generally more.
Corn virus disease, corn virus disease mainly includes corn dwarf mosaic disease and corn rough disease. Maize dwarf mosaic disease, also known as mosaic disease, can be susceptible to disease throughout the growth period of maize. At the seedling stage, the green leaves are punctate from the base of the heart, and gradually spread to the whole leaf. The veins remain green and the mesophyll tissue is chlorotic and yellow, forming obvious yellow-green stripes. A severely ill strain cannot cull or prematurely die.
Corn smut is mainly responsible for the ear and flowering of corn. Once the disease occurs, the whole plant granules are not collected. Therefore, the incidence of the disease is equal to the loss rate of the disease, and the damage is quite serious. Commonly known as "Umi" or "grey bag."
Corn ear rot, corn ear rot is divided into many types due to the different pathogens that harm corn. The main ones are Fusarium rot, Aspergillus ear rot, Penicillium ear rot and Chrysosporium. Rot and so on.
Corn bacterial wilt, corn bacterial wilt mainly occurs at the end of filling, is a fulminant, devastating disease, easily causing serious yield loss. At the end of the grain filling stage, the leaves were suddenly dry and withered, and the whole leaves were washed with water and dried. The ear was drooping and the leaves were dead. The base of the stem was initially water-soaked, and then gradually turned into a light brown color. Causes lodging.
This article URL: Map of common pests and diseases of corn
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