1 Male moth detection method
1.1 Time of induction The appropriate period for attracting male moths from Plutella xylostella, Spodoptera exigua, and Spodoptera litura in Zhejiang Province is usually at the beginning of April each year, and the southern Zhejiang region may be appropriately advanced.
1.2 The location of induced sites should be based on a reasonable selection of local crops to induce the survey area, generally to select cruciferous vegetables, contiguous planting is appropriate. Spodoptera exigua and Spodoptera litura are omnivorous pests. Conditional units can conduct surveys on different crop areas and compare their occurrences in order to accurately guide production.
1.3 traps and placement of the traps to 8cm diameter transparent trap bottles is appropriate, take the lure of a grain of fine lead fixed in the bottle mouth 1cm above the center, the bottle filled with soapy water from the bottle mouth 2cm, After the traps are fixed on the wooden sticks, they are placed in the induced area. In an induced area, three identical trap core traps should be placed, each trap being about 40m apart (straight line or equilateral triangle). Different sex lures should be placed separately to avoid mutual interference.
Under normal circumstances, sexual temps are replaced once every 10 days, and in high-temperature and arid climates, they should be replaced once every 7 days. The amount of water in the trap should be maintained and soapy water should be changed frequently.
1.4 Data recording and forecasting analysis Record the number of moths in each trap bottle daily, count the average single bottle traps and the average single bottle cumulative moth traps; and record the meteorological data (lowest temperature, highest temperature, daily average temperature, rainy days) , Precipitation, etc.), crop types and growth period (replacement), replacement of sex pheromone, and control level.
According to the peak of the average single-bottle moth trap, the peak of adult moths in the field was deduced, according to the “Trial Measures for Survey of Major Vegetable Pests and Diseases in Zhejiang Provinceâ€, the duration of each insect in different temperatures at the middlings of Plutella xylostella, Spodoptera exigua, and Spodoptera litura. , Combined with the comprehensive analysis of food conditions (crop layout and growth period), meteorological factors, and prevention and control levels, it is predicted that each generation of larvae will have a peak period. According to the total number of moths during the peak (not necessarily one day) and the average total bottle number of the entire bottle, the combination of food conditions (crop layout and growth period), meteorological factors, and control A comprehensive analysis of the level, etc., predicts the degree of occurrence of each generation of larvae.
1.5 Investigation of larval outbreaks in field offspring During the occurrence period of Plutella xylostella, Spodoptera exigua, and Spodoptera litura, different types of crops were selected every 5 days. Z-shaped sampling was used to investigate the occurrence of larvae in the field, and induced by corrective attractants. Accuracy.
1.6 Situation report During the occurrence period of Plutella xylostella, Spodoptera exigua, and Spodoptera litura, 1.4.
2 lost to the application
2.1 Principles of prevention and control The field prevention and control method adopts the "obsession method", that is, within a certain area, a large number of artificially set-up attractant lures (traps) are made to diffuse into the air and even reach the "oversaturated" state, making male moths. Under long-term sexual stimulation, fatigue and confusion after over-excited, which can not accurately determine the position and distance of female moths, interfere with their normal mating activities, thereby reducing the number of mating, reducing the female moth's reproductive capacity (effective oviposition ), reduce the amount of offspring larvae.
2.2 traps and placement of traps to 8cm diameter transparent trap bottles is appropriate, take the lure of 1-3 capsules with fine lead wire fixed at the center of the bottle about 1cm, the bottle filled with soapy water from the bottle mouth 2 cm, the traps were fixed on the sticks and placed in the induced area. The placement density of traps is generally 10-15/667m2, which can be adjusted according to the base number of field insects.
Under normal circumstances, sexual lures are replaced every 15 days. In hot and arid climates, time should be shortened.
The amount of water in the trap should be maintained and soapy water should be changed frequently.
1.1 Time of induction The appropriate period for attracting male moths from Plutella xylostella, Spodoptera exigua, and Spodoptera litura in Zhejiang Province is usually at the beginning of April each year, and the southern Zhejiang region may be appropriately advanced.
1.2 The location of induced sites should be based on a reasonable selection of local crops to induce the survey area, generally to select cruciferous vegetables, contiguous planting is appropriate. Spodoptera exigua and Spodoptera litura are omnivorous pests. Conditional units can conduct surveys on different crop areas and compare their occurrences in order to accurately guide production.
1.3 traps and placement of the traps to 8cm diameter transparent trap bottles is appropriate, take the lure of a grain of fine lead fixed in the bottle mouth 1cm above the center, the bottle filled with soapy water from the bottle mouth 2cm, After the traps are fixed on the wooden sticks, they are placed in the induced area. In an induced area, three identical trap core traps should be placed, each trap being about 40m apart (straight line or equilateral triangle). Different sex lures should be placed separately to avoid mutual interference.
Under normal circumstances, sexual temps are replaced once every 10 days, and in high-temperature and arid climates, they should be replaced once every 7 days. The amount of water in the trap should be maintained and soapy water should be changed frequently.
1.4 Data recording and forecasting analysis Record the number of moths in each trap bottle daily, count the average single bottle traps and the average single bottle cumulative moth traps; and record the meteorological data (lowest temperature, highest temperature, daily average temperature, rainy days) , Precipitation, etc.), crop types and growth period (replacement), replacement of sex pheromone, and control level.
According to the peak of the average single-bottle moth trap, the peak of adult moths in the field was deduced, according to the “Trial Measures for Survey of Major Vegetable Pests and Diseases in Zhejiang Provinceâ€, the duration of each insect in different temperatures at the middlings of Plutella xylostella, Spodoptera exigua, and Spodoptera litura. , Combined with the comprehensive analysis of food conditions (crop layout and growth period), meteorological factors, and prevention and control levels, it is predicted that each generation of larvae will have a peak period. According to the total number of moths during the peak (not necessarily one day) and the average total bottle number of the entire bottle, the combination of food conditions (crop layout and growth period), meteorological factors, and control A comprehensive analysis of the level, etc., predicts the degree of occurrence of each generation of larvae.
1.5 Investigation of larval outbreaks in field offspring During the occurrence period of Plutella xylostella, Spodoptera exigua, and Spodoptera litura, different types of crops were selected every 5 days. Z-shaped sampling was used to investigate the occurrence of larvae in the field, and induced by corrective attractants. Accuracy.
1.6 Situation report During the occurrence period of Plutella xylostella, Spodoptera exigua, and Spodoptera litura, 1.4.
2 lost to the application
2.1 Principles of prevention and control The field prevention and control method adopts the "obsession method", that is, within a certain area, a large number of artificially set-up attractant lures (traps) are made to diffuse into the air and even reach the "oversaturated" state, making male moths. Under long-term sexual stimulation, fatigue and confusion after over-excited, which can not accurately determine the position and distance of female moths, interfere with their normal mating activities, thereby reducing the number of mating, reducing the female moth's reproductive capacity (effective oviposition ), reduce the amount of offspring larvae.
2.2 traps and placement of traps to 8cm diameter transparent trap bottles is appropriate, take the lure of 1-3 capsules with fine lead wire fixed at the center of the bottle about 1cm, the bottle filled with soapy water from the bottle mouth 2 cm, the traps were fixed on the sticks and placed in the induced area. The placement density of traps is generally 10-15/667m2, which can be adjusted according to the base number of field insects.
Under normal circumstances, sexual lures are replaced every 15 days. In hot and arid climates, time should be shortened.
The amount of water in the trap should be maintained and soapy water should be changed frequently.
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