Rice planthoppers are one of the common pests in the rice cultivation process, which can be migrated over long distances with the air current, harming rice and spreading viruses. From the latest disease and insect information, the two migrated pests, rice planthopper and rice longitudinal leaf borer, have a heavy occurrence, and some areas have a large occurrence. Judging from the field observation, according to the feedback of jiangxi water repair agricultural technicians, the local rice has appeared in the yellow pond and wearing the roof; the local white-backed planthopper in Liuyang, Hunan Province, has occurred more this year, and the ground is white after the medicine. Therefore, it is recommended that farmers and friends in south China and the southern part of the Yangtze River Basin should pay attention to rice planthoppers and prevent and control them in a timely manner.
Yellow Pond Phenomenon
< h1 class= "pgc-h-arrow-right" > first, the occurrence characteristics of rice planthoppers</h1>
1. Harmful symptoms
Rice planthoppers include gray planthoppers, brown planthoppers and white-backed planthoppers, mainly adults and nymphs suck rice sap, resulting in yellow leaves and dead rice plants due to sap loss, and the damage at the panicle stage will affect the ear extraction and seed filling, empty grains, and more deflated grains. The affected rice bushes in the field often start from points and slices, and will be shorter than normal rice plants, which will seriously cause symptoms such as "yellow pond" and "impostorm".
2. Occurrence law
Rice planthoppers are migratory, migrating from south to north in spring and summer, as well as native rice planthoppers (short-winged brown planthoppers). Suitable for growth and development at a temperature of 20-30 °C, partial application of nitrogen fertilizer, excessive planting density, and relatively wet fields are prone to heavy weight. Adult white-backed planthoppers and long-winged brown planthoppers are phototropic. The abundance of broken-winged brown planthoppers indicates that brown planthoppers may erupt. In addition, trizophosphorus and pyrethroid insecticides have a stimulating reproductive effect on brown planthoppers, and irrational use can easily cause rice planthopper outbreaks.
Rice planthopper occurs in medium rice
3. In the past, there have been several more serious dwarf diseases, is the rice planthopper poisonous this year?
Planthoppers are poisonous but not individually. The main vector of the southern rice black stripe dwarf disease is the white-backed planthopper, which can transmit viral diseases such as black striped dwarf disease and striped leaf blight. The period of medium and late rice susceptible to black strip dwarf disease is the seedling stage and the early tillering stage, so the prevention of the disease should pay attention to the prevention and control of planthoppers at the seedling stage, and re-apply the drug for control 7-10 days after transplanting, and the drug can be dispensed with thiamethiazide or pyrithodone plus nimbycin.
<h1 class= "pgc-h-arrow-right" > second, prevention and control methods</h1>
1. Pharmaceutical prevention and control
The appropriate period for control is in the nymph incubation period, generally early rice should focus on medication at the panicle stage, and middle and late rice needs to pay attention to drug control from the tillering stage. The optional agents are: thiamethoxazine, sec-dingvir, isopropylvir, pyritone, alenaloxamine, furofuranamine, trifluorophenylpyrimidine, alkenin pyritone, pyritone isoprene, pyritone and furazine. After the rice spikes, the occurrence of rice planthoppers can also be prevented and controlled by spreading fine sand with dimethoidal fear.
2. Is the rice planthopper stabilized with pyrithodone, and what medicine has a good effect?
In the early stage, pilyflazone is safe, and in the later stage, trifluorophenylpyrimidine (Bai Lianglong), but trifluorophenylpyrimidine is very expensive and not easy to accept, and it is more affordable to use prayflazone from beginning to end and its compound preparation with alenopteramine and furofuran. At present, pyrithodone still has a good control effect on rice planthoppers, but it is worth noting that pyrithopridone has been widely used for more than ten years, and the risk of resistance is getting higher and higher.
Trifluoropyrimidine is a new drug, a new type of mesionic insecticide that acts on the positive binding site of nicotinoid acetylcholine receptor developed by DuPont in the United States, which is highly effective against pests such as brown planthoppers and has good fast-acting insecticidal activity, especially the special effect of preventing and controlling brown planthoppers. The recommended dose of 10% trifluoropyrimidine suspension is 10-16 mL/mu, which is controlled in the prime of the nymphs of the young age of rice planthopper. Domestically registered products also include Avi trifluorophenylpyrimidine, bromoyl trifluorophenylpyrimidine, chloropyrimidine trifluorophenylpyrimidine, selected according to local conditions.
3. Precautions
Pay attention to the prevention of medication in advance, pay attention to the amount of water when applying, try to suppress the spray head, spray the drug evenly; the application is a water layer in the field, which is conducive to improving the prevention effect. If the drone flight control is taken, the amount of flight prevention spraying liquid must be increased according to the occurrence of insect pests. Pesticides with high efficiency, low toxicity and long effectiveness should be selected in a reasonable rotation to avoid drug resistance.
Yunzhongdi service purpose: science planting technology knowledge, to solve the problem of farmers planting. More planting technology knowledge, welcome to pay attention to 【Yunzhongdi】