What are the common diseases and insect pests after sowing corn in summer? How to prevent it? What kind of medicine should I use to weed?

During the period of corn planting, there is a high incidence period of various diseases and insect pests after corn sowing and emergence, among which underground pests such as grub, mole cricket, golden needle worm, small land tiger, and two-spot armyworm, cotton bollworm, thrips and seedling blight are particularly serious. for this reason, if you want to manage the seedling stage well, you need to take precautions in advance. What are the common diseases and insect pests after sowing corn in summer? How to prevent it? What kind of medicine should I use to weed?

Common diseases and insect pests:

1. Corn seedling blight: it can be sprayed with 1500 times of carbendazim wettable powder or 1500 times of difenoconazole suspension.

2. Control thrips, planthoppers, armyworm, corn borer, cotton bollworm, etc.: 2.5% cyhalothrin or 5.7% methylaminoavermectin benzoate salt water dispersible granules 1500 times solution plus 12% avermectin suspension 1000 times solution spray control.

Preventive measures:

1. Timely removal of wheat straw and wheat bran in the field: after wheat harvest, the damage of Spodoptera litura was ecologically controlled by cleaning the field and sowing straw and wheat bran.

2. Chemical weeding.

(1) for corn fields sown with stubble, soil closure treatment should be carried out 1-3 days after sowing: the soil should be sprayed evenly on the surface of 30 kg of water with 250-300ml suspension of 48% herbicide, or 250-300ml of 40% isopropene suspension.

(2) the corn field sown with stubble can be sprayed with 65% glyphosate soluble powder 150-200g and ground closed herbicide 1-3 days after sowing.

(3) in the 2-10 leaf stage of corn, 20% nicosulfuron + 2% atrazine (safe type) suspension 200 ml, or 4% nicosulfuron (safe type) suspension 100 ml mixed with water 15 kg, stem and leaf spray.

Precautions for the use of herbicides:

The main results are as follows: (1) there are many kinds of herbicides in corn field, so we should pay attention to distinguish the application of herbicides and apply them according to the recommended dosage in order to avoid drug damage.

(2) when spraying, it is necessary to adopt the way of walking in reverse or lateral straight line to spray evenly to prevent leakage and re-spraying. The use of self-propelled spray rod sprayer should check and repair the machinery in advance, pay attention to the dosage, and prevent leakage and re-spraying.

(3) it is forbidden to use drugs during the period of high temperature at noon to avoid drug damage. It is generally mastered to spray in windless weather before 9: 00 a.m. or after 5: 00 p.m. To avoid herbicide droplets drift to nearby cotton, vegetables and other drug damage.

(4) in post-seedling stem and leaf treatment, weeds should be controlled before 3 leaves to ensure the control effect. When directional spray between corn rows, be sure to add a protective cover on the sprinkler. When the weed plant is higher, push the weed down with iron rake and then directional spray, the effect is better, and it is not easy to damage the corn plant.

(5) spraying nicosulfuron or agents containing nicosulfuron is easy to cause drug damage to some maize varieties, such as Denghai series, be careful when using the medicine. Organophosphorus pesticides were prohibited within 7 days before and after application.