After the rice enters the booting stage and the heading and filling stage, the pests and diseases are frequent, because the rice earing stage greatly affects the yield of rice and is also a dangerous period of multiple pests and diseases. Farmers often encounter many problems during the management of rice earing stage. The use of rice and panicles and disease control are as follows:
First, the use of the flag leaf and the inverted two leaves
Judging from the leaves of the flag leaf and the second leaf, it is judged that the rice has a few days of heading. The leaf pillows of the two leaves are generally broken after more than ten days.
The prevalence of control of rice false smut is 7 days before the break, and two or three days before and after the break, it also has a good effect. At this time, it is also effective to use a drug with good systemic conductivity such as tricyclazole to control rice blast; or to use a drug with poor internal conductivity such as azoxystrobin, which is less effective against ear mites but can control leaves. It can reduce the source of bacteria in the field and regulate the growth of plants. When the continuous rainy season cannot be applied at the heading stage, these drugs can still be used before the rain.
After the extraction of rice flag leaves, there is no new leaf to be taken. At this time, large doses of vigorous drugs can be used to control rice leaf roller and aphids. Applicable drugs avermectin, emamectin benzoate, indoxacarb, chlorantraniliprole, tetrachlorfenamide, etc., the duration of their effects can reach more than 20 days, can do one foot The drug is used to stabilize and control a whole generation of pests. After the drug has passed the effective period of more than half a month after the application, the texture of the rice leaf has been hard, and the larvae of the rice leaf roller can no longer be damaged by the leaf; the rice stalk has been hard at this time, the cockroach and the cockroach It is difficult for the newly hatched larvae of the locusts to enter the larvae and thus be protected from the damage. In the early stage, aphids occur in fields or areas where there are more dead seedlings. Consider using chlorantraniliprole with strong systemic conductivity and appropriate use of insecticides to control aphids more stably.
Second, see the weather decided to apply drugs
In the heading stage, continuous low temperature and rainy weather is prone to rice blast. If the heading stage encounters low temperature and rainy weather, try to control the panicle neck before the heading before the heading, and then make up the medicine according to the situation after the heading stage or the heading. Before the heading, it is advisable to use tricyclazole, rice bran, rice amide and other drugs with good internal conductivity and rain-resistant scouring; pyridoxazole and azoxystrobin can be used for rice at the heading stage or at the heading stage. And other medicines. At the heading stage and the filling period, the rainy days caused the grain to be vulnerable to saprophytic bacteria and some bacteria, and the symptoms such as moldy ears and white shells appeared, which seriously affected the yield and quality of rice. At the heading stage, the compounding agent of cemetil and azoxystrobin, thiazolidine and azoxystrobin, was used to control rice blast, which was beneficial to reduce the occurrence and damage of common bacteria in the ear.
If the weather conditions at the heading stage are good, it is not conducive to the occurrence of rice blast, so the medication can be saved a little. Generally, in the break period, tricyclazole can be mixed with rice bran or rice amide and spring leimycin. It can also be mixed with azoxystrobin, pyraclostrobin and other drugs to prevent other diseases and regulate rice growth. .
3. Is it effective to have the rain in the field for 1 hour?
After spraying, it is best to have 4 hours without rain to ensure the effect, and the final effect after application is related to the application of the drug, such as application of diazepam, pymetrozine, avid hexaflumuron, tricyclazole, guanidine The effectiveness of these agents in the rain of 1 hour is basically unaffected, and if the water does not flow out, the control effect against the sheath blight is also guaranteed.
Farmers need to pay more attention to the weather changes during the heading period. In order to prevent the pests and diseases from using the high-efficiency medicines for the amount of rice to be headed before the rain, highlight the use of medicines to control the ear mites, sheath blight, rice smut and rice leaf roller , mites and other pests; after the fight against the rain, according to the actual situation, do not apply again!
The management of rice panicles greatly affects the final yield of rice. Therefore, the strengthening of rice panicles is very important for the prevention and control of pests and diseases. If farmers do not do well in the management of rice panicles or pest control work, it may lead to a decrease in rice yield.
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