New technologies for prevention and control of rice leaf roller

In 2007, rice pests and diseases such as rice leaffolders and rice planthoppers were intensive and heavy. Among them, rice leaffolders occurred in the Yangtze River basin, Jianghuai, southwestern China, and southern China, and occurred in the past 10 years. It poses a serious threat to rice production. In accordance with the unified deployment of the Ministry of Agriculture, the major producing provinces of rice have carefully organized prevention and control actions, and the momentum of the occurrence of rice leaffolders has been effectively curbed. According to statistics, the total area of ​​prevention and control was 580 million mu, an increase of 150 million mu times over the previous year, and 9.78 million tons of rice was recovered, which was more than 4 million tons more than last year. Although the prevention and control of rice leaf roller has achieved remarkable results, the current There are still some problems:

First, the occurrence of pests is increasing. In 2007, the area of ​​rice leaffolders nationwide was 390 million mu, which was an increase of 127 million mu (47%) over 2006, of which the large-scale area reached 170 million mu. The occurrence characteristics are: wide range of occurrence, large area, early arrival, high peak times, large moths, high density of field worms, and long duration of damage, occurring more than in the same period of 2003, field natural hazards The rate is about 50%, up to 90% According to preliminary estimates, the country lost 850,000 tons of rice due to damage caused by rice leaf roller.

Second, it is difficult for farmers to master control methods. . The suitable period of control for rice leaf roller is from egg hatching to young larvae stage. Because the rice farmer can not master the key technologies of field investigation and control, lack knowledge of pests and natural enemies, it often misses the best period of prevention and cure, combined with insufficient technology and water spray volume. Small, inappropriate application methods, and improper varieties of drugs affect the control effect.

The third is excessive dependence on chemical pesticides, and the negative impact is serious. In recent years, due to insufficient support for comprehensive prevention and control technologies such as biological control and physical control and farmers' training, the phenomenon of simple and over-reliance on chemical pesticides is widespread in production. The number of pesticides used is large and the dosage is large. In addition, the supervision of pesticides is weak. Extensive use of fipronil in local areas and even the use of pyrethroid pesticides that are banned by the State have resulted in the destruction of biodiversity in paddy fields.

Influenced by factors such as climate, cultivation methods, and ecological environment, the rice leaffolders in 2008 are still re-emerging, and the prevention and control tasks will reach about 400 million mu. In order to improve the effectiveness of prevention and control, reduce the negative impact of disaster risks and traditional methods of prevention and control, and ensure the safety of rice production, we must focus on the following aspects:

1. Promote comprehensive prevention and control technologies to improve the ecological environment of rice fields. Demonstration area of ​​Juchao City, Anhui Province, carried out biological pesticide Bt. Formulation control of rice leaf roller leafhopper showed that the average insecticidal effect of the fourth generation rice leaf roller leafhopper was 85.71% and the leaf protection effect was 85.14%. The cumulative total number of spiders in the comprehensive defense demonstration field was 8,350 heads/hundred thousand bushes. The demonstration area is 36% higher. The ecological balance of rice fields in the demonstration area has enhanced natural control of rice planthoppers and other pests. The Jianyang Demonstration Zone in Fujian Province was used to seduce pests such as rice leaf roller and other pests. Surveys showed that the number of larvae in the non-light-controlled area was 19,455, and the light control area was 4,720, which was only non-lamps. 24% of the controlled areas also have certain control effects on locusts, rice planthoppers and other pests. The cost of prevention and control is only 41% of chemical control, which not only effectively controls the hazards, but also reduces the use of chemical pesticides and protects the ecology of rice fields. Improve the quality of agricultural products.

2. The new agent is administered profenofos to control. Comprehensive analysis of data from several experimental demonstration sites shows that 40% Profenofos EC has good control effect on rice leaf roller, 80-100 g of preparation constant per acre between the peak of egg hatching and the peak period of young instar larvae. Or mist spray, the control effect on young instar larvae of rice leaf roller can reach 90% or more, and the control effect on rice planthoppers is more than 95%. At the same time, it can also treat other rice pests such as pupa, and the overall control effect is generally better than Currently used in the production of pharmaceutical species, and the safety of crops, is expected to replace the traditional varieties of high-risk environmental agents. In 2007, the technicians and rice farmers conducted technical training on Propofos against rice leaf roller in the pilot demonstration site, which enabled this technology to be rapidly promoted. Promud Bromine in provinces (cities) such as Hunan, Anhui, Shanghai and Jiangxi Phosphorus has become the first choice for the control of rice leaf roller, and its large-scale application effect has been recognized by the majority of rice farmers and grass-roots technicians.


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