Efeito da temperatura e umidade relativa do ar no desenvolvimento de Liriomyza sativae Blanchard (Diptera: Agromyzidae) em Vigna unguiculata

Abstract

-This research aimed to study the infl uence of temperature and relative-humidity (RH) on the development of Liriomyza sativae Blanchard during the egg-adult period, in cowpea, to provide essential information for future biological control projects against the pest. An inverse relation was observed between temperature increase in the range from 15°C to 32°C and development duration. Larval survival was not affected in the temperature range studied, while a high mortality of pupae was observed at 32°C (59.9%). RH did not affect the development time of the immature stages, although it infl uenced their survival. The lower developmental temperature threshold obtained for the egg-adult period was low (7.3°C) when compared with other species of Liriomyza, and was rather low for the larval stage (3.4°C). Based on the thermal requirements for L. sativae, it was possible to estimate the occurrence of 24.5 annual generations at a melon producing region in state of Rio Grande do Norte, Brazil. For laboratory rearing aimed at biological control pest programs, the best rearing conditions are 30°C and 50% RH for the larval stage and 90% RH for the pupal stage.KEY WORDS: Leaf miner, abiotic factor, thermal requirement, biology, molecular characterization RESUMO -A pesquisa teve como objetivo estudar a infl uência da temperatura e da umidade relativa do ar (UR) no desenvolvimento de Liriomyza sativae Blanchard, durante o período ovo-adulto, em feijão caupi, para fornecer subsídios a futuros projetos de controle biológico da praga. Verifi cou-se uma relação inversa entre o aumento da temperatura na faixa de 15°C a 32°C e a duração do desenvolvimento. A sobrevivência larval não foi afetada na faixa térmica estudada, enquanto a 32°C houve alta mortalidade de pupas (59,9%). A UR não afetou a duração dos estágios imaturos, embora tenha infl uenciado a sua sobrevivência. O limiar térmico inferior de desenvolvimento obtido para o período ovo-adulto foi baixo (7,3°C), se comparado a outras espécies de Liriomyza, e bastante reduzido para a fase larval (3,4°C). De acordo com as exigências térmicas constatadas para L. sativae foi possível estimar a ocorrência de 24,5 gerações anuais na região produtora de melão, em Mossoró, RN. Para criações de laboratório, visando à implementação de programas de controle biológico da praga, as melhores condições são temperatura de 30°C e UR de 50% para a fase de larva e 90% para o estágio de pupa de L. sativae.

Biological aspects of the leafminer Liriomyza sativae (Diptera: Agromyzidae) on melon (Cucumis melo L.)

“…This larval survival was higher than the observed by COSTA-LIMA et al (2009) for L. sativae on V. unguiculata (84.8%) and the pupal survival was similar (78.8%). Literature presents a large variation on survival of larvae and pupae of Liriomyza (LEIBEE, 1984;LANZONI et al, 2002).…”

New sources of resistance to leafminers (Liriomyza sativae) in melon (Cucumis melo L.) germplasm

“…Therefore, this is the main pest species in the melon production areas of the Jaguaribe-Açu agricultural region, and corroborates the findings of previous studies (Costa -Lima et al, 2009;Araújo et al, 2013;Ferreira, 2014).…”

Temperature-Dependent Development of Two Neotropical Parasitoids of Liriomyza sativae (Diptera: Agromyzidae)

“…One of the desirable requirements for a biological control agent is that its life cycle must be shorter than that of its host. The parasitoids studied, O. scabriventris and C. vonones , showed a shorter egg–adult period compared with L. sativae on cowpea plants (16.5 days), i.e., 2.2 and 3.4 fewer days, respectively at 25°C ( Costa-Lima et al. 2009 ).…”

“…In Brazil these insects are important pests of melon ( Araujo et al. 2007 ), bean ( Costa-Lima et al. 2009 ), onion ( Ramalho and Moreira 1979 ), potato ( Bueno et al.…”