Effect of temperature and sperm supply on the reproductive potential ofTetranychus evansi (Acari: Tetranychidae)

Abstract

Moraes, G.J. de and McMurtry, J.A., 1987. Effect of the temperature and sperm supply on the reproductive potential of Tetranychus evansi (Acari: Tetranychidae). Exp. Appl. Acarol., 3: 95-107.The biology of Tetranychus evansi Baker and Pritchard was studied at five different temperatures on excised leaves of Solanum douglasii Dunal. The theoretical lower threshold temperature of development was ca. 13~ The combined immature stages required ca. 148 day-degrees for completion. Progressively later initiation of mating resulted in higher peak proportions of females produced, up to an 8-day period between emergence and mating at 30 ~ C. The proportion of male offspring always increased towards the end of the oviposition period, apparently because of sperm depletion. The calculated intrinsic rate of increase was highest (0.432) at 35 ~ C, the highest temperature tested. At that same temperature, daily oviposition rate and net reproductive rate were maximum (9.5 and 111.77, respectively), and mean generation time and doubling time were minimum (10.92 and 1.6 days, respectively).

Development and life table parameters of Tetranychus turkestani (Acarina: Tetranychidae) at different constant temperatures

“…Moraes and McMurtry (1987) observed an almost identical pattern in Tetranychus evansi at temperatures ranging from 15 to 35°C. However, Margolies and Wrensch (1996) reported that sex ratio of T. urticae females exposed to a high temperature (32°C) was more male biased (0.536) than for females exposed to a low temperature (22°C , 0.727).…”

Efficiency of Phytoseiulus longipes Evans as a control agent of Tetranychus evansi Baker & Pritchard (Acari: Phytoseiidae: Tetranychidae) on screenhouse tomatoes

“…It seems that in all four experiments conducted the prevailing temperatures were adequate for the development of T. evansi (Moraes & McMurtry 1987, Bonato 1999. The increase of P. longipes population in the course of each experiment was also expected, as this predator has a high potential for population growth when feeding on T. evansi (Furtado et al 2007).…”

“…The rapid population growth of T. evansi in the control plots was expected, given the high biotic potential of the pest (Moraes & McMurtry 1987, Bonato 1999) and the fact that prevailing conditions in protected cultivation often favor the development of spider mites (Sabelis 1985, Bonato 1999.…”

Biological aspects of Tetranychus marianae McGregor (Acari, Tetranychidae) reared on yellow passion fruit (Passiflora edulis Sims f. flavicarpa Deg.) leaves

“…The author also reviewed a series of studies on the development of several Tetranychidae species. MORAES & MCMURTRY (1987) reported a period of 13.1 days for Tetranychus evansi Baker & Pritchard, 1960, on Solanum douglasii Dunal (Solanaceae), at 25ºC. NORONHA et al (1995) obtained periods from eggs to adults varying from 12.6 to 13.1 days for Mononychellus tanajoa (Bondar, 1938) on four varieties of cassava.…”

“…The adult females are red in color (JEPPSON et al 1975, FLECHTMANN 1989. This species has also been described as a pest on cotton as well as occurring on other crops such as castor bean, passion fruit, papaya and cassava, besides other herbaceous plants (JEPPSON et al 1975, MORAES et al 1987, BONATO & GUTIERREZ 1999 (CAVALCANTE et al 1977, MORAES & FLECHTMANN 1981, MORAES et al 1987.…”