Maize dwarf mosaic disease is also called streak disease, yellow-green stripe disease, and the pathogen is corn dwarf mosaic virus disease. Generally, corn can be reduced by 5% to 10%, which can cause significant losses.

The whole infection period of corn can be infected, and the plants infected with seedlings have obvious symptoms and serious losses. The diseased plant is weak, thin and small, and grows slowly. The plant height is often less than half of the height of the healthy plant. The diseased seedlings initially have many small dots or mottles between the veins at the base of the heart leaf, and are arranged along the veins as intermittent strips of varying lengths. Symptoms gradually spread to the whole leaf, forming several green strips with different lengths and different shades in the thick veins. The leaf flesh is chlorotic and yellow, and the veins remain green. Therefore, it is also called mosaic disease, and the disease is further developed. The color of the leaves turns yellow, and the tissue becomes hard and brittle and even dry. Most of the diseased plants die in advance and cannot be headed.

The maize dwarf mosaic virus overwinters on hosts such as bromegrass, verbena, or in seeds of certain varieties, and becomes an important primary infestation source. There are more than 20 kinds of aphids spread such as corn borer, peach aphid, and birch. Non-persistent ways to spread and juice friction spread. The onset incubation period is about 7 days at 20-32 ° C and about 4-5 days at 35 ° C or above. The number of poisonous aphids is large, the climate is dry, and the management of extensive plots is heavy. The incidence of spring corn is generally lighter than that of summer corn, and early sowing of summer corn is lighter than late sowing of summer corn. The number of rains and the abundant rainfall is not conducive to the migration and spread of aphids, and the disease is light. Maize hybrids are more resistant than parental inbred lines.

Prevention:

Cultivation management measures

(1) Planting excellent hybrids resistant to disease, such as Luyu 11, Ludan 46, Ludan 053, Jidan 321, 941, etc.

(2) Adjust the sowing date so that the corn seedling stage avoids the peak of the migration of aphids from the wheat field to the corn field.

(3) Strengthen field management, timely weeding and weeding, and removal of diseased plants for destruction.

(4) Seedling transplanting can reduce the occurrence of diseases.

2. Chemical control

Seed dressing with 10% imidacloprid wettable powder with 0.1% weight of corn seed was effective in controlling seedling stage aphids, thrips and planthoppers. When it was found that the central plant can be sprayed with 50% anti-Converse WP 1500 times solution. When the rate of sputum is 30%~40%, the whole field should be treated when honeydew is present. It can also be used for the control of poisonous sand. Use 50% lycopene emulsifier 50 liters per 667 m2, dilute 500 liters of water, mix 15 kg of fine sand, and then spread the mixed poisonous sand evenly on the heart of the plant. 1 gram per plant. It can treat both thrips, corn borer and armyworms.