According to my station's recent investigation, this year the main diseases and pests that occurred in the early rice of our county are: rice blast, aphids, rice leaf roller, and sheath blight. Due to the current large amount of rainwater, the migratory pests, rice leaf roller and white back rice borer, have a large amount of migration and are relatively serious.
Indica rice: Mainly in white-backed rice cultivars. It was first seen on the light of May 20 (last year, May 8), and the rice seedlings moved into the peak from June 16 to June 25. The rush hour occurred on the 25th. There were 3,926 heads, including 3,801 white-backed rice dumplings. June 25 field survey of 232.5 head rice ridges/hundred plexus, including 198 heads/hundred plexus of white-backed rice, 82 heads/hundred plexus of long-winged nymphs, 27 heads/hundred plexus of senior nymphs, 89 heads/hundred nymphs of young instars Brown planthopper 3.5 heads/hundred plexus, long-winged adult 2.5 heads/hundred plexus, short-winged adult 1 head/hundred plexus, gray rice borer 31 heads/hundred plexus, among them old nymph 7.5 heads/hundred plexus, 3 young nymphs 3 heads; / 100 plexus, long-winged adult 20.5 head / hundred plexus. Observing the total rice nursery 615 heads/hundred plexus, with 600 heads/hundred plexus. It is particularly pointed out that some of the recent uncontrolled field plots in spring flower fields are particularly high (the number of insects in the field surveyed amounts to 5,115 heads/hundred plexus). It is expected that white rice pods in the late rice season will weigh heavily.
Second-generation II: On June 4th, a total of 11767 worms per mu were surveyed, which is a decrease of 29.11% compared with 16600 peas per acre in 2006, which is higher than that in the normal years. It is expected that the second-generation locusts will hatch in July. On the 10th, it was moderately serious and the control period was July 10-15.
Rice leaf roller: Due to the high amount of three (2) insects, long moth peaks, and less favorable control effects in the early stage, the amount of field insects is still high.
Rhizoctonia solani: At the beginning of the year on May 25, the base of the disease was high, especially in the recent continuous high temperature and rainy weather, the phenomenon of partial nitrogen fertilization was still more serious, the degree of shading in rice fields was increased, and the sheath blight was developing rapidly. It is expected that the bias will occur.
Prevention opinion:
1. Control measures: Early-inset early rice is used to treat white-backed rice borers, aphids, and sheath blight, and concurrently control rice leaf roller; late-planting early rice, single-season rice, and late-season rice cultivation are dominated by white-backed rice borers, aphids, and rice leaffolders. , And cure sheath blight.
2, control period:
Inaba: July 5-10;
Erhuai: July 10-15.
3, the choice of pharmaceuticals: rice bran use 25% imidacloprid 15-20 g / acre, rice leaf roller use 40% chlorpyrifos EC 80 ml / acre, old rice leaf roller with 31% Sanhe microemulsion 50-60 ml / Mu, locusts can use 5% Rui Jin special 30 ~ 40 ml / mu, sheath blight use 5% Jinggangmycin 100 ml / mu.
Public welfare warning:
In high-temperature weather, pay attention to the safety of medications, and pay attention to the safety interval of pesticides in late rice.
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