(2001) reported that red netting increased and blue netting decreased branch lengths of variegated pittosporum. These effects can influence crops as well as the organisms associated with them. They can provide physical protection (birds, hail, insects, excessive radiation), affect environmental modification (humidity, shade, temperature) ( Pérez et al., 2006), and increase the relative proportion of diffuse (scattered) light as well as absorb various spectral bands, thereby affecting light quality. These nets can be used outdoors as well as in greenhouses. More recently, colored shade netting (shadecloth) designed specifically for manipulating plant development and growth has become available. Efforts to manipulate plant morphology and physiology using photoselective filters have been ongoing for decades, especially in greenhouse environments ( Cerny et al., 2003 Ilias and Rajapakse, 2005 Kambalapally and Rajapakse, 1998 Li et al., 2000 Mortensen and Stromme, 1987 Rajapakse and Kelly, 1991, 1992, 1995 Rajapakse et al., 1999 Wilson and Rajapakse, 2001a, 2001b).

Light, along with other environmental cues, enables plants to adapt to environmental conditions. There are numerous photoreceptors in plants, including chlorophylls, phtyochromes, cryptochromes, phototropins, and ones that react to green light ( Batschauer, 1999 Folta and Maruhnich, 2007). Higher plants respond to light quantity, quality, direction, and periodicity. Keywords: cut foliage disease flowering fruiting photoselective radiation scattering shade cloth vegetative yield

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