Occurrence and Control of Diseases and insect pests in the Middle stage of planting Rice

According to the investigation of diseases and insect pests in the field, the number of moths and eggs in the field of the third generation of Chilo suppressalis is large. It is hoped that the towns will actively do a good job in prevention and control.

1. What happens:

(1) the third generation of longitudinal leaf roller:

1. The number of moths in the field: according to the observation of each measuring point, the number of moths in the field began to increase at 728, Xiayang, Jinze, Zhujiajiao, evaporation and Liantang were 530,800,313,1065 and 890 / mu respectively. The number of moths in the field increased further, and the highest number of moths in the field reached 2050. It is expected that the number of moths in the field will continue to rise.

2. The number of eggs in the field: according to the census of 7stroke 30, the average number of eggs per mu is 10600, the highest number of eggs per mu is 40,000, and the first-grade eggs account for 72.5%, the second-grade eggs account for 22.5%, and the third-grade eggs account for 5.0%. 8According to the systematic investigation, the average egg number was 21700 and the highest field mass was 87500. In addition, the ovaries of some female moths were dissected according to the district station 7ram 30, of which grade 1 and grade 2 accounted for 28.6%, grade 4 and grade 5 accounted for 71.4%, indicating that some of the local worms in the field were already local, and adults would continue to lay eggs. It is estimated that the peak of egg hatching is about 8 stroke 3.

(2) Rice planthopper:

According to the observation under the light of the station in the district, the adult migration peak appeared on 7 scale 20-22, with a total of 2558 white-backed planthoppers, 818 brown planthoppers and 122 gray planthoppers. According to the general survey of 7x30, the average number of eggs per mu of white-backed planthopper was 307700, and the highest number of eggs per mu was 1.675 million; the average number of eggs per mu of brown planthopper was 73000, and the highest number of eggs per mu was 950000; the average number of eggs per mu of gray planthopper was 108700, and the highest number of eggs per mu was 512500 eggs.

(3) sheath blight:

According to the investigation, at present, the incidence of sheath blight in early planting and early sowing fields is more common. The average rate of diseased plants is 0.61%, the disease index is 0.18, the highest rate of diseased plants in the field is 7.8%, and the disease index is 2.52. In particular, most of the mechanically inserted rice has been closed, the small environment in the field is depressed, and the continuous high temperature at the beginning of August will be conducive to the occurrence and spread of sheath blight.

(4) stripe blight:

At present, there is the first peak of rice stripe blight in the field, and some fields are more serious. According to the general survey of 7x30, the average diseased plant rate was 1.34%, the disease index was 0.91, the highest field diseased plant rate was 6.4%, and the disease index was 4.75.

Second, suggestions on prevention and control:

1, the purpose of control: the main treatment of the third generation of longitudinal leaf borer, sheath blight, rice planthopper and rice stripe blight, big borer.

2. Control object: all rice.

3. The time of prevention and cure: 8 stroke 4-6.

4. Use medicament: kill 20% per mu? Propiophos 130ml + 20% methylvitamin? Poison 60 grams (or 20% pyridazine parathion 80 ml) + 15% Jinggangmycin A 35 grams.

Matters needing attention

1. The fields where rice stripe blight has occurred in the field, combined with this control, add 8% ketoke (Ningnanmycin) water agent 45 ml (3 packets) per mu, spray 50 kg of water, and spray again every 5 days to passivate the virus and slow down the spread of the disease.

2. The mechanical transplanting seedling field uses 40% poison within 3 meters along the ridge of the field. XinEC 75ml uses small machine spray to control Chilo suppressalis.

3. After medication, the liquid and field water should be avoided to be directly discharged into fish ponds, shrimp ponds and other aquaculture places.

4. If there is a shower within 4 hours after application, please do the remedial work in time.

5. In the hot weather, taking advantage of the morning and evening, self-protection measures must be taken to prevent poisoning accidents.