Recently, some corn in some districts and counties in Beijing have developed diseases such as smut, smut, cotton bollworm, and blind beak. They need to be prevented and prevented. Today, this edition publishes the relevant contents provided by the Beijing Plant Protection Station. It is hoped that it will be helpful to the actual production of farmers.
1 Spring corn first control disease
Smut quick remedy
The symptoms of spring corn tumor smut showed a tumor producing a tumor. The appearance of the tumor was a grayish white film. The inside of the tumor was tender, white, soft and juicey, and turned grayish black after maturation. The tumor contains a lot of black powdered teliospores, and after the appearance of the membrane ruptures, the teliospore disperses and spreads the disease.
There is currently no effective agent in the control of tumor smut, and once it can only take the appropriate remedial measures, the specific methods include: 1. Promptly control pests and reduce wounds. 2. Remove tumors in time and bring them out of the field for destruction. 3. Deeply plunge the soil deeply or perform more than two years of rotation.
Head smut prevention
The symptoms of head smut in spring corn are mainly male flower deformation, and the male flower base is swollen with a pack of black powder inside, and no tassel can be formed. Corn head smut, also known as Umi, dumb corn, the pathogen is silkworm powder. The disease is the invasive and systemic infective disease at the seedling stage. The pathogenic bacteria use winter spores to overwinter on soil, seeds or sicknesses. It germinates under suitable conditions in the following year and mainly invades through the coleoptile. After the pathogen enters the growth point, it expands with plant growth. To the whole plant.
Head smut prevention and control should be based on prevention, specific methods include: 1. Selection of disease-resistant varieties. 2. Seed treatment with a seed coating containing a tebuconazole component such as 2% Rikenxi wet mix. 3. Remove the diseased strain and destroy it before the tumor ruptures.
2 Summer corn remediation
Bollworm control must pay attention
The cotton bollworm on the summer corn is of the family Lepidoptera Noctuidae. The mature larvae are 30 to 42 mm in length and vary in body color, ranging from pale green, reddish to dark brown, yellow-brown in the head, and dorsal line and subfamily. Lines and valve lines are dark vertical lines, valve white, ventral toe hook is a double sequence in the belt. The two frontal burr edges tangentially or intersect with the lower end of the chest valve. The body surface is covered with small thorns and its bottom is larger.
Feeding leaves of the cotton bollworm larvae can cause holes or nicks, sometimes biting off the heart and causing dead heart. Damaged ears often eat out of the filaments and bite the young grains, in addition to direct loss of yield, but also increase the occurrence of ear rot. The control of Helicoverpa armigera can use foliar sprays such as 2.5% cyfluthrin EC 2000 times, 5% cypermethrin EC 1500 times before the third instar larvae, and insecticidal granules in corn leaves. For example, 0.1% or 0.15% fluorochloroaluminum granules, 1.5 g per plant; or 14% chlorpyrifos granules, 3% butylthiocarbagram granules, 1-2 g per plant; or 3% phoxim granules , 2 g per plant; or use 50% phoxim EC as a 1:100 poisonous soil and mix it into the bell mouth. Sprinkle 2 g per plant.
Red beard must be strengthened
The red-bearded aphid on summer corn, also known as red beard, belongs to the family Hemiptera. Red-bearded adult cricket slender, 5 to 6 mm long, 1 to 2 mm wide, bright green
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