Journal of Insect Science (2008) 8 (4), p. 27 (Legaspi et al.)

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Jesusa Crisostomo Legaspi, Alvin M. Simmons and Benjamin C. Legaspi Jr. (2008)
Life history of Delphastus catalinae: A predator of Bemisia tabaci
Journal of Insect Science 8 (4), 27-27
in P. A. Stansly and C.L. McKenzie, organizers: Fourth International Bemisia Workshop - International Whitefly Genomics Workshop, December 3-8, 2006, Duck Key, Florida, USA
Abstract: Immature development and reproductive life history of Delphastus catalinae (Coleoptera: Coccinellidae) feeding on Bemisia tabaci (Homoptera: Aleyrodidae) immatures was studied at three constant temperatures: 22, 26 and 30 ºC. Development rates and lower temperature threshold temperatures (T0) were estimated at 9 and 9.9 ºC, for males and females, respectively. Thermal units required for immature development was about 300 degree-days in both sexes. As temperature increased from 22 to 30 ºC, immature development time from eggs to pupae declined from 24 to 15 days, and adult longevity ranged from 138 and 77 days. The intrinsic rate of increase rm, increased from 0.048 to 0.082 and doubling time DT decreased from 14.44 to 8.45 days as temperature increased from 22 to 26 ºC. Results indicated that D. catalinae was found to perform best from 22 and 26 ºC; while 30 ºC was detrimental to immature development and adult reproduction. In a separate experiment, we studied the effect of plant species and insect stages on feeding by D. catalinae on B. tabaci. To study the influence of plant species, immature whitefly prey were presented simultaneously to starved predator adults on leaf cuttings of five different plant species: cotton (Gossypium hirsutum), tomato (Lycopersicon esculentum), Hibiscus (Hibiscus rosasinensis), cowpea (Vigna unguiculata) and collard (Brassica oleracea). Percentage predation over 24 h was significantly highest on cotton, followed in rank order by collards, cowpea and tomato, and lowest on Hibiscus. Different predation rates may have been caused by differential response to volatile secondary compounds released by the leaf cuttings. Host stage preference was studied by presenting individual adult predators with equal numbers of prey (200 per replicate) in three aggregate life stages: eggs, small nymphs (1st to 3rd instars) and large nymphs (4th to pupae). Significantly higher numbers of eggs were consumed in a 24-h predation period, compared with small or large nymphs. These findings suggest that among the plant species tested, D. catalinae may be most effective on early-season cotton or immediately after whitefly infestation when eggs are predominant.
Database assignments for author(s): Jesusa Crisostomo Legaspi, Alvin M. Simmons

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
environment/habitat manipulation


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Bemisia tabaci Cabbage (Brassica oleracea)
Bemisia tabaci Tomato (Solanum lycopersicum)
Bemisia tabaci Cotton (Gossypium)
Bemisia tabaci Cowpea and relatives (Vigna)
Delphastus catalinae (predator) Bemisia tabaci Cabbage (Brassica oleracea)
Delphastus catalinae (predator) Bemisia tabaci Tomato (Solanum lycopersicum)
Delphastus catalinae (predator) Bemisia tabaci Cotton (Gossypium)
Delphastus catalinae (predator) Bemisia tabaci Cowpea and relatives (Vigna)