High temperature and humidity weather attention to scientific medication

Since the inception of the volcano, the province has experienced continuous high temperatures and suffered heavy rain in recent days. The field is susceptible to hail formation and the humidity has increased. This has provided conditions for epidemic diseases such as corn, rice, cotton, and open field vegetables. Therefore, scientific medicine is used. It is critical to strengthen the prevention and control of pests and diseases.

It is often heard from some farmers that the application of pesticides in the rainy season is poor. The rainy season is a period of high incidence of pests and diseases. It is necessary to master techniques in the control of pesticide application in order to improve the control effect. To increase the effect of pesticide application in the rainy season, pay attention to the following points when applying pesticides:

See the weather when it is time

In general, the effect of applying the pesticide after rain is better than the rain after application or the rain while spraying. Therefore, we must pay attention to the weather conditions and choose the best spraying during the weather to improve the control effect.

Choose the right medicine

In the rainy season, the use of systemic absorption, quick-acting, rain-resistant and microbial pesticides is better.

Systemic pesticides. Systemic pesticides can enter the plants through the roots, stems, and leaves of crops, and they are transported to other sites and function within a short period of time. For bactericides such as carbendazim, triadimefon, leaf bromide, triadimefon, thiophanate-methyl, chlorfenone, and omethoate, 80% of the active ingredients are absorbed into the tissues within 4 to 5 hours after application. , less loss of medicinal properties due to rain leaching.

Quick-acting pesticides. For example, pesticides such as dichlorvos, fast extinguishers, killer pines, enemy killers, fast killing agents, speed killers, anti-influencers, pyrethroids and other pesticides have strong contact and poisoning effects. The pests can be killed 1 to 2 hours or 4 to 5 hours after the medicine. It is less affected by the rainy season.

Washable pesticides. The bactericidal agents such as chlorhexidine, tricyclazole, and sulfamethoxazole have good resistance to rain, and even if they encounter showers after 1 to 5 hours of application, they will not be affected by scouring.

Microbial active pesticides. Commonly used microbial pesticides such as BT? 781, Helicobacter, Beauveria bassiana, etc., are more favorable to the germination and reproduction of their sporophytes in high humidity conditions. The use of such pesticides in cloudy and rainy days can give full play to their insecticidal effects.

Add adhesives to the liquid

Adding an appropriate amount of adhesive such as washing powder to the liquid medicine can enhance the adhesion of the pesticide on crops and insect pests, thereby improving the control effect.

The method is: add 50-75 grams of detergent powder per 50 kilograms of liquid medicine, and spray it in time after stirring. Note that it is best to use it now.

Wind spraying pesticides

It is necessary to spray in the downwind direction to prevent the spraying of pesticides in the direction of the wind from falling on the ground, or to cause pesticide poisoning. (plant protection)

With the onset of the rainy season, high temperatures and high humidity can easily lead to various diseases and insect pests in fruit trees. In particular, apples without clams and other apples are the epidemic period of anthrax, and if they are not properly prevented, they will cause serious losses. The prevention and control measures are described as follows:

Clear the source of the disease and combine the winter pruning to do a good job in the Qingyuan Garden. Carefully remove the dead fruits and dead branches on the tree. During the growing season, the early stage fruits are removed in time to prevent the bacteria from being repeatedly infected.

Strengthen the cultivation and management efforts to improve the orchard's ventilation and light conditions, timely drainage in the rainy season. Increase organic fertilizer,

Control the amount of fruit to increase tree vigor and increase disease resistance.

At the same time pay attention to the use of foliar fertilizer, especially calcium indispensable, according to many years of experience, under the conditions of sufficient calcium supplement, Wyatt apple anthracnose relative reduction.

The prevention and control of spraying anthrax in apple is mainly to prevent the spraying of drugs before bagging, and to prevent and control the germination of dried anthrax. Before the germination of fruit trees, spraying “sterilization is strong” (12% myclobutanil) 1000 times, has a good effect on reducing the source of overwintering bacteria. The growth period is generally 10 days after the flower

Right after the start of spraying control, enter the center of the diseased plant and severe ward after July to give priority to the use of drugs, continuous spraying 3 to 4 times. The specific spraying period depends on the rainfall conditions, adhere to spraying after the rain, rain and more rain, spray less rain. Commonly-used pharmaceuticals include 800-fold solutions from Mebond Corp., 1000-fold solution from "Ai Mu" (70% thiophanate-methyl), 1000-fold solution from Bing-Sendo, or 1000 times of "Anti-microbial" (72% of Fortune Zinc). , once in 10 days.

In order to balance the control of other diseases, the top (80% tebuconazole water dispersible granules) 8000 times solution can be added at the same time.

The rainy season is the peak period of weeds, and it is also the season with the highest number of herbicides and the high incidence of phytotoxicity. According to common conditions in practical applications, farmers are reminded to take effective measures to avoid the occurrence of injury.

To choose the right variety. Each herbicide has a strict range of use, and different crops require different herbicides, even if the same crop needs different herbicides in different growth stages and different diarrhea. For example, butachlor and acetochlor, although only a word difference, the former applies to paddy fields, the latter applies to dry fields. Therefore, when purchasing drugs, be sure to select the label and indicate the object to be controlled. The method of use is suitable for you.

In strict accordance with the instructions of the amount and method of use, not arbitrarily increase or decrease the amount of drugs, and do not re-spray, no leakage spray. The writer saw a lot of peasants hating grass and arbitrarily increasing their usage. There are also some pesticide dealers who use the means to increase efficiency to pull back customers to achieve more sales, and recommend farmers to use high concentrations of herbicides. It is not uncommon for phytotoxicity to increase the use of concentrations and amounts.

Strictly prevent damage to non-target crops. The use of 2,4-D butyl esters in spring wheat fields was the most prominent due to the migration of other dicotyledonous plants. Damaged cotton showed leaf anxiousness, curling, malformation, withering, dwarfing of plants, budding bells falling off, bolls getting smaller and deformed, generally reduced by about 30%, and severely reduced by more than 50%. Dicotyledonous plants such as cotton, peanuts, vegetables, and tobacco are very sensitive to 2,4-D butyl esters. Wheat should be avoided in areas where wheat is mixed with these crops. In order to prevent the herbicide from drifting hazards, it is necessary to spray in windless or breezy conditions. The direction of the spray hole should be consistent with the direction of the wind, and the direction of wind should be perpendicular to the wind direction or the included angle should not be less than 45 degrees. First spray the wind and then spray the wind to prevent wind. The liquid drifts with the wind and harms sensitive crops.

Pay attention to prevent damage to the crop (seasonal). Some herbicides have a long residual period and cause damage to the crops. Therefore, when selecting herbicides, it is important to consider what kind of crops are to be planted.

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