Efficacy of CC Traps and Seasonal Activity of Adult <I>Bemisia argentifolii</I> (Homoptera: Aleyrodidae) in Imperial and Palo Verde Valleys, California

Abstract

Adult whitefly Bemisia argentifolii Bellows & Perring trap (CC trap) catches were compared with suction type trap catches. CC trap catches were significantly correlated to the suction trap catches. Higher numbers of B. argentifolii adults were caught in CC traps oriented toward an untreated, B. argentifolii-infested, cotton field as compared with traps oriented toward Bermuda grass fields, farm roads, or fallow areas. CC trap catches at five heights above ground (from 0 to 120 cm) were significantly related to each other in choice and no-choice studies. CC trap catches were low in the Imperial and Palo Verde Valleys from late October to early June each of 1996, 1997, and 1998. Trap catches increased with increasing seasonal air temperatures and host availability. Trap catches were adversely affected by wind and rain. Abrupt trap catch increases of 40- to 50-fold for 1-2 d in late June to early July followed by abrupt decreases in adult catches suggest migrating activity of adults from other nearby crop sources.

Bemisia tabaci(Hemiptera: Aleyrodidae) Species Complex from Cotton Cultivars: A Comparative Study of Population Density, Morphology, and Molecular Variations

“…Comparatively less density of glandular trichomes was observed on the cultivars with high incidence of B. tabaci. These findings are in hne with Schuster et al (1993), Chu et al (2001), Ashfaqetal. (2010, and Zia et al (2011) who reported less glandular trichomes whenever there is high B. tabaci population density.…”

Identification of Resistance to Insect Pests Infestations in Cotton (Gossypium hirsutum L.) Varieties Evaluated in the Field Experiment

“…Okra-leaf strains and cultivars, as a group, had lower numbers of adults, eggs and nymphs compared with normal-leaf strains and cultivars indicating the potential of okra-leaf genetic traits for reducing colonization by B. tabaci. Results also suggest that okra-leaf shape may provide less favorable micro-environmental conditions for the habitat of B. tabaci because of more open canopy as evidenced by higher leaf perimeter to leaf area ratio (Chu et al, 2002). Adults and larvae of B. tabaci feed by sucking from the phloem bundles of the leaves, and are attracted by the yellow colour and believed not to react to odours.…”

Trap catches of the sweetpotato whitefly (Homoptera: Aleyrodidae) in the Imperial Valley, California, from 1996 to 2002

“…Based on color, light orientation and landing behavior of adult B. tabaci, we developed a non-sticky trap (named the CC trap) that allowed more cost-effective, efficient trap service scheduling time and maintenance (Chu et al, 1995(Chu et al, , 2001. The CC trap does not lose efficacy because of dust, debris and insect contamination associated with sticky traps.…”

“…The sweetpotato whitefly, Bemisia tabaci (Gennadius) biotype B, has a wide host range occurring on more than 540 plant species in 77 families (Gill, 1992;Basu, 1995). In most agricultural areas of southwestern United States, a year-round source of host plants provide B. tabaci shelter, food and reproduction habitats (Chu et al, 2001). In the Imperial Valley, California, 58 species of agronomic and horticultural plants and 19 weed species were identified as B. tabaci reproductive hosts (Natwick et al, 2000).…”