Aspectos biológicos da fase adulta de Chrysoperla externa (Hagen, 1861) (Neuroptera: Chrysopidae) oriunda de larvas alimentadas com Planococcus citri (Risso, 1813) (Hemiptera: Pseudococcidae)

Abstract

RESUMOObjetivou-se estudar alguns aspectos biológicos da fase adulta de Chrysoperla externa (Hagen) quando as larvas desse predador foram alimentadas com ninfas e fêmeas adultas de Planococcus citri (Risso). O experimento foi conduzido em câmara climatizada regulada a 25 ± 1 o C, 70 ± 10% de UR e fotofase de 12 horas. Os adultos de C. externa cujas larvas foram alimentadas com ninfas nos três ínstares e fêmeas adultas da cochonilha, foram separados por sexo e 25 casais foram individualizados em gaiolas determinando-se a razão sexual, período de pré-oviposição, capacidade de oviposição diária e total durante 40 dias consecutivos, longevidade, período embrionário e viabilidade de ovos. Constatou-se que as ninfas nos três ínstares e fêmeas adultas fornecidas como alimento, não afetaram a razão sexual, período de pré-oviposição, período embrionário e longevidade dos adultos de C. externa. A produção diária e total de ovos por C. externa foi afetada pelo tipo de alimento fornecido ao predador durante a fase de larva, observando-se uma maior produção quando os casais foram alimentados na fase de larva com fêmeas adultas da cochonilha. Analisandose a produção de ovos, observou-se uma maior concentração de oviposição nos primeiros dez dias do período reprodutivo, decrescendo nas avaliações seguintes. Foram obtidas porcentagens maiores de ovos viáveis e menores de inviáveis e inférteis, porém, não diferiram em função do alimento fornecido ao predador na fase de larva. Termos para indexação:Crisopídeo, capacidade predatória, cochonilha-branca, biologia. ABSTRACTIt was aimed to study some biological aspects in the adult stage of Chrysoperla externa (Hagen) when the larvae of predator were fed both nymphs and adult females of Planococcus citri (Risso). The experiment was conducted in climate chamber at 25 ± 1°C, 70 ± 10% of RH and 12-h photophase. The adults of C. externa whose larvae were fed nymphs at the three instars and adult females of mealybug were separated by sex and 25 couples were individualized in cages of PVC determining sex ratio, pre-oviposition period, daily and total oviposition for 40 days on end, longevity, embryonic period and survival rate of eggs. It was found that the nymphs at the three instars and adult females given as food did not affect sex ratio, pre-oviposition period, embryonic period and longevity of adults of C. externa. The daily and total egg production by C. externa was affected by the sort of food given to the predator during the larval stage, observing a greater production when the couples were fed at the larval stage with adults females of mealybug. By assessing egg production, a higher concentration of oviposition on the first ten days of the reproductive period was found, decreasing in the next evaluations. The survival rates of eggs not differ in function of feed in the different stages of development of prey that was consumed by differents predator larvae stage.

A DNA barcode reference library of Neuroptera (Insecta, Neuropterida) from Beijing

“…Because of the predatory feeding habits, some lacewing species, e.g., the species of Chrysopidae, Hemerobiidae, and Coniopterygidae, are economically important and have been used for the biocontrol of agricultural pest insects (Goolsby et al 2000; McEwen et al 2001; Sato and Takada 2004; Bezerra et al 2006; Abdrabou 2008; Vidya et al 2010; Messelink et al 2016). However, the species identification of these lacewing groups is not easy to handle, particularly for people who are not the specialists of Neuroptera, because there are many morphologically similar species, which require examination of detail morphological characters, such as marking patterns on body and genitalia.…”

Biological control of mealybugs with lacewing larvae is affected by the presence and type of supplemental prey

“…Lacewing larvae are potential candidates to apply to the so-called ''hot spots'' of mealybugs in greenhouse crops. Larvae of some lacewing species were shown to feed on all stages of citrus mealybugs (Bezerra et al 2006) and earlier studies showed promising control of mealybugs with green lacewing larvae Hagen 1949, 1950;Goolsby et al 2000). However, mealybugs may not be the most suitable and preferred prey of lacewing larvae.…”