First, symptoms and hazards
The symptoms of corn rough dwarf disease are corn diseases that can occur after emergence, and corn begins to show obvious disease in the 5-6 leaf stage. However, the leaves of new leaves are not easily extracted and become smaller, which is the basis for early diagnosis. On the sides of the midrib of the heart leaf, a transparent dotted spot initially appeared on both sides of the leaf, gradually extending to the entire leaf, and wax-white protrusions of varying lengths were produced on the midrib of the leaf. The diseased plants are characterized by dark green color, wide, short, hard, and brittle leaf veins on the back of the leaves. In the internodes of diseased plants, severe dwarfing was significantly shortened, and leaves were densely regenerated. In pairs, the diseased plants resembled the symptoms of the leaves. The diseased plants resembled the plants of the “Kitzulan†plant with few and short roots, and were less than 1/2 of the length of the healthy plants, and were easy to pull out. Root bifurcation, clustered. The roots turn brown and lignified. There was no yield of early-onset corn, and late-onset corn production was low.
Second, the law of occurrence
Poisonous planthoppers or nymphs of adult scorpions live under the weeds on the ground and in the fields below the field. They are the source of infestation early in the year. Winter wheat is also the host of the virus overwintering. In the spring, the poisonous planthoppers spread the virus to the green wheat. The non-toxic Laodelphax striatus also spread the virus to the rejuvenated wheat after being infected with the diseased wheat. After that, the wheat and weeds were used again. Spread to corn. The incidence of this disease depends to a large extent on the number of individuals and the number of fields in the field of SBPH. It is also related to the cultivation conditions. The occurrence of early sown maize is more important than that of late sowing maize. The incidence of corn fields in the land, ground, and roadside weeds is heavy. , Near wet and weedy corn fields such as vegetable fields, the incidence of heavy.
Third, control methods
1. Selection of resistant and disease-resistant varieties. The current corn varieties that are more resistant to corn rough dwarf diseases are Ludan 50, Ludan 981, and Nongda 108, which can be selected according to local conditions.
2. Agricultural control. Before the harvest of crops such as wheat and corn, we remove the weeds at the edge of the field and the ditch. We will intensively cultivate the crops and timely weed control in crop fields to reduce the source of insects. Appropriate adjustment of the corn sowing period will miss the peak of SBPH at seedling stage. Reasonably arrange the planting method. Strengthen field management, timely fertilize and water, improve plant resistance to disease. Combine seedlings with seedlings and remove diseased plants in time to reduce diseased plants and sources of infection, and severely change the early-onset plots.
3. Chemical control. Wheat: First, seeding or coating with systemic insecticides in a large area at the time of sowing can use 40% methyl isothiophosphorus to be seeded or coated with 0.2% of the seed amount to reduce overwintering insect sources. The second is to combine the control of wheat bran, the use of wheat bran, corneal prickly yam, or pharmacology, or in the control of wheat bran pharmacy to add the prevention and control of Laodelphax striatellus for wheat bran control. Wheat aphid and Laodelphax striatellus can be used to control 10g of 10% imidacloprid per acre, and 25% of acne killers can also be added to control agents of wheat aphid. Corn: First, dressing or coating with systemic insecticides, 40% methylisophosphoric acid can be used to seed or coat 0.2% of the seed amount; second, chemical control before emergence, can be used per acre. 10% of 10% imidacloprid prevention and treatment, the nymph of Laodelphax striatellus can be used per acre with 25% of catching turtle spirit 20 grams of prevention and control, while attention to Tianbian, ditch edge prevention and treatment.
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