-Thermal requirements of Phytoseiulus macropilis (Banks) fed with Tetranychus urticaeKoch at five constant temperatures (18, 20, 23, 26 and 30°C), and the effect of three constant temperatures (20, 23 and 26°C) on the adult stage were studied. The data were used to produce the fertility life tables. The stages of egg, larva, protonymph, deutonymph and adult egg corresponded to the temperature thresholds of 12.6, 13.1, 11.6, 13.4 and 12.7°C, respectively, and thermal constants of 26.65, 10.27, 16.04, 13.31 and 66.04 DD, respectively. The average duration of a generation (T) varied from 24.3 to 18.5 days at the temperatures from 20°C to 26°C. The highest net reproduction (R 0 = 35,3) and the intrinsic rate of increase (r m = 0,19) were obtained at 23ºC. The highest fecundity rate was registered at 26ºC.KEY WORDS: Mite, biology, Phytoseiid, thermal constant RESUMO -Estudaram-se as exigências térmicas de Phytoseiulus macropilis (Banks) alimentado com Tetranychus urticae Koch em cinco temperaturas constantes (18, 20, 23, 26 e 30°C), e determinouse o efeito de três temperaturas constantes (20, 23 e 26°C) sobre os parâmetros biológicos da fase adulta do ácaro. Os dados foram utilizados para construir tabelas de vida de fertilidade. Os estágios de ovo, larva, protoninfa, deutoninfa e período de ovo-adulto apresentaram temperaturas base de 12,6; 13,1; 11,6; 13,4 e 12,7°C, respectivamente, e constantes térmicas de 26,65; 10,27; 16,04; 13,31 e 66,04 GD, respectivamente. A duração média da geração (T) variou de 24,3 a 18,5 dias entre as temperaturas de 20°C e 26°C. A maior taxa líquida de reprodução (R 0 = 35,3) e a maior capacidade intrínseca de aumento populacional (r m = 0,19) foram obtidas a 23ºC. A maior fecundidade foi verificada a 26ºC.

No abstract

Tetranychus evansi Baker and Pritchard and Tetranychus urticae Koch (Acari: Tetranychidae) are important pests of Solanaceae in many countries. Several studies have demonstrated that T. urticae is an acceptable prey to many predatory mites, although the suitability of this prey depends on the host plant. T. evansi, has been shown to be an unfavorable prey to most predatory mites that have been tested against it. The predator Phytoseiulus fragariae Denmark and Schicha (Acari: Phytoseiidae) has been found in association with the two species in Brazil. The objective of this work was to compare biological parameters of P. fragariae on T. evansi and on T. urticae as prey. The study was conducted under laboratory conditions at 10, 15, 20, 25 and 30 degrees C. At all temperatures, survivorship was lower on T. evansi than on T. urticae. No predator reached adulthood at 10 degrees C on the former species; even on the latter species, only about 36% of the predators reached adulthood at 10 degrees C. For both prey, in general, duration of each life stage was shorter, total fecundity was lower and intrinsic rate of population increase (r(m)) was higher with increasing temperatures. The slower rate of development of P. fragariae on T. evansi resulted in a slightly higher thermal requirement (103.9 degree-days) on that prey than on T. urticae (97.1 degree-days). The values of net reproduction rate (R (0)), intrinsic rate of increase (r(m)) and finite rate of increase (lambda) were significantly higher on T. urticae, indicating faster population increase of the predator on this prey species. The highest value of r(m) of the predator was 0.154 and 0.337 female per female per day on T. evansi and on T. urticae, respectively. The results suggested that P. fragariae cannot be considered a good predator of T. evansi.

No abstract

No abstract

-The thermal requirements of Tetranychus abacae Baker & Printchard in Musa sp. cv. Prata were studied at constant temperatures (20; 23; 25,5 and 30°C), as well as the effect of the temperatures on the adult phase. Age-specific life tables were built with the data. The basal temperature and thermal constant for egg, larva, protonymph, deutonymph and egg-adult development were: 14,9; 15,2; 14,2; 16,2 and 15, 3°C and 47,7; 25,4; 25,5; 27,4 and 124,3 GD, respectively. High fecundity was registered at 25,5°C. The mean duration of the generation (T) varied from 50,03 to 13,51 days between 20ºC and 30°C. The net reproductive rate (R 0 ) was high at the temperature of 25,5°C, increasing 28,7 times at each generation. The intrinsic rate of natural increase (r m ) and the finite rate of increase (λ) 47,7; 25,4; 25,5; 27,4 e 124,3 GD para as fases de ovo, larva, protoninfa, deutoninfa e período de ovo-adulto, respectivamente. A maior fecundidade foi verificada na temperatura de 25,5°C. A duração média da geração (T) variou de 50,03 a 13,51 dias entre as temperaturas de 20ºC e 30°C. A taxa líquida de reprodução (R 0 ) foi maior na temperatura de 25,5°C, aumentando 28,7 vezes a cada geração. A capacidade reprodutiva (r m ) e a razão finita de aumento (λ) variaram de 0,049 e 1,05 a 0,226 e 1,25 entre as temperaturas de 20ºC a 30°C, respectivamente. Estimou-se que T. abacae pode desenvolver até 31 gerações por ano a 26°C em condições de campo e 43 gerações por ano a 30°C em condições de casa de vegetação, no estado de Pernambuco.

RESUMO A presente pesquisa foi desenvolvida na Cidade de Recife-PE, com o objetivo de avaliar a ação inseticida, insetistática e repelente de extratos aquosos de duas essências florestais sobre ovos, ninfas e adultos de

Clitoria fairchildiana (Howard) is a tree largely distributed in Brazil, used for urban arborization. In April 2001, the psyllid Euphalerus clitoriae Burckhardt & Guajará was reported on this plant in the metropolitan areas of Recife, PE, Brazil. This report records the occurrence of E. clitoriae and studies some of its biological aspects in this area. With this purpose, C. fairchildiana leaves were sampled weekly, and E. clitoriae nymphs as well as Aprostocetus sp. larvae and nymphs were collected and counted. The E. clitoriae population ranged from 2 to 90 nymphs per leaflet. The Aprostocetus sp. percentage of parasitism ranged from 3 to 24%. The frequency curve for pygidium width ranged from 120 to 140; 200 to 240; 300 to 380; 460 to 580, and 720 to 820 µm for the first, second, third, fourth, and fifth instars, respectively. The incubation period for E. clitoriae eggs lasted 7.6 days. The nymphal stage lasted 5.7; 4.5; 4.8; 5.0, and 6.1 days for the first, second, third, fourth, and fifth instars, respectively. Development time from egg to adult was 33.7 days. Female longevity 8.6 days, with a daily fecundity of 118 eggs. The total viability of the immature stage was 74%, and the sex ratio was 0.5.