Control effect of purple light on Tetranychus cinnabarinus population in greenhouse strawberry
Tetranychus cinnabarinus is one of the main pests on strawberries,and the non-chemical control of T.cinnabari-nus is an important means of strawberry production.In this paper,the effect of violet light on the population of T.cinnabarinus was studied to provide a theoretical basis for the application of violet light to repel insects in strawberry shed.Through the relationship between RGB value and virtual light wavelength on the computer,the best light wavelength that can repel T.cinnabarinus was selected.The strawberry plant was irradiated with purple light with a wavelength of 410 nm.Four treatments and different light periods were set up,namely,00:00-06:00,06:00-12:00,12:00-18:00 and 18:00-24:00.The effects of different light periods and durations on the repellent effect of T.cinnabarinus and the development duration of T.cinnabarinus were studied respectively.A purple light band on the strawberry plant was placed in the greenhouse,turned on from 18:00 to 24:00 every day,and the quantity of T.cinnabarinus on the strawberry every 7 days,and the corrected population decline rate were analyzed.The results showed that the selection rate of T.cinnaba-rinus for 410 nm light was the lowest(3.89％).Purple light from 18:00 to 24:00 in a day had the strongest repellent effect on T.cinnabarinus,and the corrected rate of population decline was significantly higher than that in other time peri-ods.Purple light had a good repellent effect on T.cinnabarinus on potted strawberry.After 7 days of purple light treat-ment,the corrected population decline rate of T.cinnabarinus reached 69.33％,and there was no significant difference between the corrected population decline rates of different leaf positions.After 8 days of strawberry leaves exposed to purple light,the development duration of T.cinnabarinus was 28.01％longer than that of the control.Purple light had a good repellent effect on T.cinnabarinus on strawberry in facilities.The number of T.cinnabarinus on control strawberry was 2.38 times that of purple light treatment.The corrected rate of decline of T.cinnabarinus population was positively correlated with light duration(P＜0.05).Purple light has a strong repellent effect on strawberry T.cinnabarinus and can prolong the development period of T.cinnabarinus.The control effect of purple light on strawberry T.cinnabarinus in greenhouse is better from 18:00 to 24:00.
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