First, the armyworm
According to the investigation of grass-trapping and field insects, it is expected that the occurrence of large and wheat armyworms will be delayed this year, and the occurrence is moderately light. The specific basis is as follows:
1. Period of occurrence
According to the test area from March 1st to April 12th, the grass will be tempted, and the egg will be seen on March 21st. The peak of spawning will be March 28-30, which is about 10 days later than that in 2003. The egg hatching observation and egg hatching peak On April 9-11, the peak of the third instar larvae in the field is expected to be at the end of April.
2. Amount of occurrence
According to the test area, the average number of eggs was 1.9, which is similar to that of the year of 2003. It is a mid-lighter year. The survey area was surveyed on April 13th, with an average of 3,200 insects per acre, ranging from 0 to 10,000. The amount of occurrence between the fields is extremely uneven.
Second, gray rice blast
On April 14th, the survey area surveyed an average of 41,200 insects per acre, ranging from 2.5 to 63,000. As the temperature rises, the amount of insects in the field will increase significantly.
In addition, there are more aphids in the current size of wheat fields. According to the survey on April 13th, there are 293,000 aphids per acre.
Third, prevention and treatment opinions
According to the above situation, combined with the poisoning of gray rice blast in the past year, the occurrence of stripe leaf blight and black streak dwarf disease in a few paddy fields in our city, from the perspective of comprehensive prevention and control, the following prevention and control opinions are proposed:
1. Control object field: all sizes of wheat fields.
2. Proper control period: barley April 20-25, wheat April 25-30.
3. Pesticide control: 10% sputum per mu or 18-20 g water plus 3 backpack spray for gray rice blast and aphid, but for some particularly late maturity and black field and field insects Add 90% crystal trichlorfon 75 grams to treat the armyworm.
According to the investigation of grass-trapping and field insects, it is expected that the occurrence of large and wheat armyworms will be delayed this year, and the occurrence is moderately light. The specific basis is as follows:
1. Period of occurrence
According to the test area from March 1st to April 12th, the grass will be tempted, and the egg will be seen on March 21st. The peak of spawning will be March 28-30, which is about 10 days later than that in 2003. The egg hatching observation and egg hatching peak On April 9-11, the peak of the third instar larvae in the field is expected to be at the end of April.
2. Amount of occurrence
According to the test area, the average number of eggs was 1.9, which is similar to that of the year of 2003. It is a mid-lighter year. The survey area was surveyed on April 13th, with an average of 3,200 insects per acre, ranging from 0 to 10,000. The amount of occurrence between the fields is extremely uneven.
Second, gray rice blast
On April 14th, the survey area surveyed an average of 41,200 insects per acre, ranging from 2.5 to 63,000. As the temperature rises, the amount of insects in the field will increase significantly.
In addition, there are more aphids in the current size of wheat fields. According to the survey on April 13th, there are 293,000 aphids per acre.
Third, prevention and treatment opinions
According to the above situation, combined with the poisoning of gray rice blast in the past year, the occurrence of stripe leaf blight and black streak dwarf disease in a few paddy fields in our city, from the perspective of comprehensive prevention and control, the following prevention and control opinions are proposed:
1. Control object field: all sizes of wheat fields.
2. Proper control period: barley April 20-25, wheat April 25-30.
3. Pesticide control: 10% sputum per mu or 18-20 g water plus 3 backpack spray for gray rice blast and aphid, but for some particularly late maturity and black field and field insects Add 90% crystal trichlorfon 75 grams to treat the armyworm.
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