Effects of UV-Absorbing Plastic Films on Greenhouse Whitefly (Homoptera: Aleyrodidae)

Abstract

Studies were conducted to investigate the effects of ultraviolet (UV)-absorbing plastic films on the orientation and distribution behavior of the greenhouse whitefly, Trialeurodes vaporariorum (Westwood). In field experiments, small tunnels were constructed and covered with either an UV-transmitting (Thermilux) or UV-absorbing (K-Rose) plastic film. Results show that significantly more whiteflies were recorded in the tunnels with high compared with those with low UV intensities. Moreover, whitefly penetration and dispersion were less inside the UV-deficient tunnels. These results suggest that the type of plastic film used for greenhouse covers may have a significant influence on both the initial immigration and distribution of T. vaporariorum into greenhouses. The possibilities of using UV-absorbing plastic films for whitefly integrated pest management in greenhouses are discussed.

Eficacia de diferentes diodos emisores de luz (LEDs) unidos a trampas adhesivas amarillas para la captura de la mosca blanca Trialeurodes vaporariorum

“…The above results are supported by Mutwiwa et al, (2005) who reported that T. vaporariorum adults were more attracted to areas with a maximum refraction or transmittance in the green-yellow area (520-610nm) than to 360-380nm ultraviolet. Based on the different response of T. vaporariorum to the wavelength in the UV and yellow area Coombe (1982) and Mellor et al, (1997), the results also showed the positive response of greenhouse adult whiteflies to green areas of visible spectrum (550 nm).…”

Flutuação populacional de adultos de Anastrepha fraterculus (Wied.) em cultivo protegido e convencional de videira

“…Mesmo com o conhecimento deste fato, neste trabalho não foi observada uma antecipação na captura das moscas na área coberta. Mutwiwa et al (2005) estudaram a influência de diferentes coberturas plásticas na infestação e distribuição de mosca-branca (Hemiptera: Aleyrodidae) na cultura do pimentão, em cultivo protegido. Estes autores observaram que onde foi utilizado plástico com absorção de radiação ultravioleta, houve menor infestação da praga, em comparação com plástico sem absorção, destacando a importância da luz ultravioleta na mobilidade deste grupo de insetos e os efeitos de diferentes coberturas plásticas como tá-ticas de controle em programas de manejo integrado de pragas.…”

Seasonal climatic variations influence the efficacy of predatory mites used for control of western flower thrips in greenhouse ornamental crops

“…A greenhouse structure is typically built as a means of enhancing control over climatic variables in order to maximize crop production and extend growing seasons to yearround, regardless of the external environment (Mutwiwa et al, 2005). The climate within a greenhouse can be discussed in terms of the macroclimate or general greenhouse climate (i.e.…”

“…Most plastic-covered greenhouses use a polyethylene plastic that absorbs UV light and blocks light wavelengths of 200-400nm (Mutwiwa et al, 2005). Many insect species have UV light receptors which influence vision and olfaction (Doukas & Payne, 2007).…”