Control of cotton bollworm, Helicoverpa armigera (Huebner) by yellow fluorescent lamps on grenhouse roses [Rosa]
2003
Imura, T. (Nara-ken. Agricultural Experiment Station, Kashihara (Japan)) | Fukui, T.
Summary Effects of overnight illumination with yellow fluorescent lamps on infestation of the cotton bollworm , Helicaverpa amige,1a (Huebner) was investigated in a rose culture greenhouse . The area of the investigated greenhouse was about 5 a. Eight lamps, which used a commercial electric outlet on a heater as electricity sources, were placed in the western half of the greenhouse from June 28 , 2002. The eastern half was the control. All lamps in the western half were removed and four lamps were placed in the eastern half on September ll. Electrical sources were changed to a solar battery system on September 24 . The number of Cotton bollworm eggs and larvae and the rate of injured buds were investigated from July 5 to October 22 . Overnight illumination with yellow fluorescent lamps was effective in reducing bollworm damage as a result of reducing the number of eggs and larvae. Illumination on a horizontal plane above I m height ranged from 1.6 lux to 12.7 lux. Its average was 6.9 lux. Yellow light illumination did not affect rose growth. This paper presents discussion of control of bollworms, effects on rose growth , and the possibility of practical use for rose cultivation . Furthermore , we address the significance of introducing a solar battery system.
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