Biological characteristics of Telenomus alecto and Trichogramma galloi reared on eggs of the sugarcane borer Diatraea flavipennella

Abstract

Brazil is the world's largest producer and exporter of sugarcane with an estimated 625 million tones of raw material being processed in the sugar mills and ethanol distilleries during the 2010/2011 season. In the state of Alagoas, about 438,570 hectares are planted with sugarcane, making this state the largest producer in the Northeast Region of Brazil with an estimated harvest of 26.75 million tons of raw material in the 2010/2011 season (CONAB 2011). Each year, the limits of the areas of sugarcane have expanded in Brazil, leading to substantial increase of the risk of pest infestation. In this context, crambid moths of the genus Diatraea (Lepidoptera, Crambidae) are of particular importance because of the frequency with which they occur and the damage that they cause (Botelho et al. 1999). Two species of this genus of borers, namely, Diatraea saccharalis Fabricius, 1974 and Diatraea flavipennella (Box, 1931), are considered the principal sugarcane pests in Brazil (Cheavegatti-Gianotto et al. 2011). While the former species is widely distributed in sugarcane-producing areas throughout the country, the latter is restricted to Alagoas and surrounding states in the Northeast Region (Freitas et al. 2006). The biological control of Diatraea spp. typically involves Cotesia flavipes Cameron, 1891 (Hymenoptera, Braconidae), a larval parasitoid imported from Asia in the 1970's. Although this wasp has a relatively low production cost and is capable of providing an effective control of sugarcane borers, application of an egg parasitoid would be more efficient since the egg stage represents a key factor in the population increase of this pest (Botelho et al. 1999). In addition, identifying native parasitoid species that could be effective against many

Características biológicas de parasitóide de ovos criados em diferentes hospedeiros

“…Dias-Pini et al (2012) verificaram o percentual de emergência de 82 %, quando ovos de Diatraea flavipennella (Lepidoptera, Crambidae) foram utilizados como hospedeiros para Trichogramma galloi. Deste modo, devido ao elevado percentual de emergência das espécies de Trichogramma do presente estudo, a interação com as espécies A. kuehniella, P. xylostella e H. zea foi considerada como adequada.…”

Seleção De Parasitoides De Ovos Para O Controle Biológico Da Broca-Gigante Da Cana-De-Açúcar

“…A avaliação seguiu a metodologia empregada por Dias-Pini et al (2012). Fêmeas recém-emergidas dos parasitoides foram transferidas individualmente para tubos de vidro, cada um contendo uma cartela com ovos de T. licus e uma gota de mel como fonte de alimentação.…”

Evaluasi pelepasan Trichogramma spp. untuk pengendalian penggerek pucuk dan batang tebu

“…Pelepasan T. chilonis sebanyak 8 kali dengan dosis 8-10 pias/ pelepasan/acre dapat meningkatkan parasitisasi telur penggerek hingga 80% di pertanaman tebu Filipina (Javier & Gonzales 2000). Di Thailand dilaporkan bahwa parasitoid telur T. chilotraeae Nagaraja & Nagarkatti dan parasitoid larva C. flavipes merupakan agens hayati yang digunakan dalam program pengendalian kompleks penggerek tebu (Suasa-ard 2010), sedangkan di Brazil, Telenomus alecto Crawford dan Trichogramma galloi Zucchi dipelajari dan dimanfaatkan sebagai agens pengendali penggerek tebu Diatraea flavipennella (Box) (Dias-Pini et al 2012).…”