After the wheat is lately planted, no chemical weeding is carried out before winter, and the temperature rises after the spring, so it is necessary to seize the favorable opportunity for chemical control, because the temperature of the early spring rises, weeds are dense, grow vigorously, and there are many types. At the same time, it is necessary to prevent the occurrence of spring cold and avoid the occurrence of drug damage. Generally, the average daily temperature can be 5 ° C-8 ° C, and spraying can be performed after 9 am and before 3 pm.
But for the chemical weeding of wheat after the year, it can be described as "short time and heavy task", so the chemical control of wheat after the year is very important. Therefore, farmers' friends should choose the best time to use medicine and appropriate medicines for one-time prevention and control.
Wheat weeding formula:
1. Oatmeal + see Mai Niang + brome + broadleaf grass, you can choose: 50 ml of paracetamol + flusulfuron 4 g + 20 ml of fluorid + make it 30 ml + auxiliary, spray.
2. Wild oatmeal + see Mai Niang + Japanese see Mai Niang + Brome + multi-flower ryegrass + hard grass and other grass weeds and broadleaf grass, you can choose: trimethoate 50ml + flusulfuron 4g + Bifluoro 20 ml + make it 30 ml + priority 20 ml + isopromone 125 g + adjuvant, spray.
3, Festival wheat + yarrow + watch Mai Niang + Japan watch Mai Niang + Brome + multi-flower ryegrass + hard grass + oats + broadleaf grass, you can choose: 50 ml paracetamol + flusulfuron 4 g + Bifluoro 20 ml + Make it 30 ml + Shima 25 ml + Isoprom 125 g + Auxiliary, spray.
4. Oatmeal + see Mai Niang + Japanese look Mai Niang + multi-flower ryegrass + yarrow + hard grass + brome + most broadleaf grass, you can choose: azoxystrobin 80 ml + 250 ml isoprolong + make it 50ml + additive, spray.
Note: The temperature is stable above 5 ° C, the three leaves are more than one heart, there is no wind to apply medicine at noon on a sunny day, do not have a drastic cooling temperature one week after the application, do not re-spray, do not apply medicine.
One step to catch pests
Insect Pests: Aphids, Red Spiders, Spodoptera frugiperda, Underground Pests
Aphids, red spiders
Early spring temperature rises and humidity is high, sowing wheat aphids and red spiders early will be more serious. Then when the rainy days last a long time, pay attention to the occurrence of wheat sheath blight and root rot in the field. At this time, prevention and control should be combined with high-quality foliar fertilizer to raise seedlings.
Wheat red spider and wheat aphid are mainly harmed by sucking wheat juice. In general, red spiders mainly have yellow-white spots at the base and lower leaves of wheat stems, and have severe leaf curling.
Starscream is generally not easy to find; it usually reproduces faster at a temperature of about 15 ° C. You can choose to observe it in the morning or evening to find it easily. Aphids reproduce at an alarming rate. They can multiply for 10-20 generations a year. If conditions are appropriate, they can generally reproduce for one week and can continuously spread wheat virus disease.
Control method: Generally, a combination of quick-acting and sustained-acting agents is selected: enopyridine, pymetrozine, and lambda-cyhalothrin.
Spodoptera litura
Spodoptera frugiperda is mainly concentrated in wheat-maize rotation fields, and eats autologous corn seedlings, wheat stems and leaves. Occurrence field density is generally 4-6 heads / m2, re-transmission fields are generally 20-50 heads / m2, up to 125 heads / m2. The larvae of the field are complex in age, and they are present at all ages. The larvae's feeding damage spreads around the center area, and individual fields cause lack of seedlings and ridges. It is recommended to choose medicines containing mevalonate and chlorantraniliprole for control. Appropriately increase the amount of water used and apply pesticides in the evening when the larvae are active to ensure the control effect.
Underground pest
The main hazards are: needle worms, maggots, and tadpoles. The temperature rises after the spring and the harms increase. Insufficient control of underground pests will cause wheat to die, scum and lodging. Underground pests mainly occur in maggots, maggots, and gold needles, most of which account for more than 85%.
In terms of specific prevention and control, farmers can choose to apply phoxim granules in front of cultivated land. Promote pesticide seed dressing control technology in areas where underground pests are common. You can choose to dress with thiamethoxam, imidacloprid or phoxim. When dressing seeds, pay attention to the amount of pesticides to prevent phytotoxicity.
Diseases: Sheath blight, Root rot
Particular attention should be paid to fields without seed coating when sowing; rain is heavy, humidity is high, and temperature rise is beneficial to the occurrence of sheath blight and root rot at the seedling stage.
Rhizoctonia solani: The pathogen of Rhizoctonia solani overwinters in the soil, and generally begins to infect after sowing. The high-incidence period is when the spring is warming, and the seedling stage can cause wheat to die.
Root rot: Root rot will occur throughout the growth period, mainly harming the roots of wheat. The damage will appear dark brown, and the plant's stem base will have dark brown spots. Then the overall performance of wheat is standing, which will indicate interruption of nutrient delivery and yellowing in advance. To die.
For wheat root diseases, root rot and total etch are not effective, only the seed coating effect is relatively better. At this time, it is unrealistic to choose the root irrigation method, so you can use the triazole agents such as benzpropiconazole and tebuconazole to alleviate the yellowing, and prevent the occurrence of sheath blight; Do not blindly increase the dosage of azole fungicides, it has a certain chemical control effect on flourishing seedlings.
Pay attention to freezing damage
The temperature difference between morning and evening is relatively large in early spring due to frequent cold air activities. If the cold air is strong, the temperature can drop drastically below 10 ° C, and even rain and snow may occur. This is the "cold spring cold", we must pay close attention, otherwise the impact on the wheat will be greater; after the tillering period of wheat is affected by the "cold spring cold", there will be dry and white flowers like the boiled plants after boiling water. Leaves and main stems are twisted and withered. It may eventually lead to a 20% -30% reduction in wheat production. Severe conditions may lead to a reduction of more than 50%.
For the wheat before the cold spring arrives or frost damage occurs, it is generally taken to spray up and spray down for supplementary prevention. Take the opportunity to replenish green fertilizer (5-8 kg urea / mu) in time to promote effective hoeing and improve wheat immunity. Farmer friends are advised not to sprinkle fertilizer in the field before or when it rains. Fertilizer utilization is highest after the rain stops. For fields that have been fertilized, combined with the control of wheat diseases and insect pests, regulators represented by amino acids are added.
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