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Suitability of leguminous cover crop pollens as food source for the green lacewing Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae).

Venzon, Madelaine ; Rosado, Maria C. ; Euzébio, Denise E. ; Souza, Brígida and Schoereder, José H. (2006) Suitability of leguminous cover crop pollens as food source for the green lacewing Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae). [Adequação do pólen de leguminosas utilizadas em adubação verde como fonte de alimento para Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae).] Neotropical Entomology, 35 (3), pp. 371-376.

PDF - Published Version - English

Online at: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2006000300012


Diversification of crops with species that provide suitable pollen for predators may reduce pest population on crops by enhancing predator effectiveness. In this paper we evaluated the suitability of leguminous cover crop pollens to the predatory green lacewing Chrysoperla externa (Hagen). The predator is commonly found in coffee agroecosystems and the plant species tested were pigeon pea and sunn hemp, which are used in organic coffee systems. Newly emerged females and males of C. externa were reared on diets containing pollen of pigeon pea, sunn hemp, or castor bean, used as a control. The reproductive success of C. externa was evaluated when females fed the pollen species and when honey was added to the diets, to verify the predator need for an extra carbohydrate source. Similar intrinsic growth rates were found for females fed on pigeon pea pollen and on sunn hemp pollen but these rates increased significantly when honey was added to the diets. Females fed with pigeon pea pollen plus honey and with sunn hemp pollen plus honey had higher intrinsic growth rates than those fed with castor bean pollen plus honey. Females fed on castor bean pollen only or on honey only, did not oviposit. Leguminous pollen species were equally suitable for C. externa especially when they were complemented with honey. The results suggest that to successfully enhance predator effectiveness, organic coffee plantation should be diversified with plant providing pollen in combination with plant providing nectar.

Summary translation

A diversificação das culturas com plantas que forneçam pólen nutricionalmente adequado para predadores pode reduzir a população de pragas pelo aumento da efetividade dos predadores. Neste trabalho, avaliou-se a viabilidade nutricional de polens de leguminosas utilizadas como adubação verde, para o crisopídeo Chrysoperla externa (Hagen), comumente encontrado em agroecossistemas cafeeiros. Os adubos verdes testados foram guandu e crotalária, leguminosas utilizadas em sistemas orgânicos de café. Adultos de C. externa recém-emergidos foram criados em dietas contendo pólen de guandu, de crotalária e de mamona (controle). O sucesso reprodutivo de C. externa foi avaliado nas dietas de pólen e quando mel foi adicionado ao pólen, para se verificar a necessidade do predador por fonte extra de carboidratos. A taxa de crescimento populacional do predador foi semelhante nas dietas de pólen de guandu e de crotalária. No entanto, a taxa aumentou significativamente quando mel foi adicionado às dietas. Fêmeas alimentadas com pólen de guandu e mel e com pólen de crotalária e mel tiveram crescimento superior ao das alimentadas com pólen de mamona e mel. Fêmeas alimentadas somente com pólen de mamona ou somente com mel não ovipositaram. Os polens de guandu e de crotalária foram igualmente adequados para C. externa, especialmente quando foram complementados com mel. Os resultados sugerem que para aumentar a efetividade dos predadores, os sistemas orgânicos de café deveriam ser diversificados com plantas que forneçam pólen em combinação com plantas que forneçam néctar.

EPrint Type:Journal paper
Keywords:Controle biológico conservativo, Predador, Café, Cajanus cajan, Crotalaria juncea, Crisopídeo. Conservation biological control, Predator, Coffee, Cajanus cajan, Crotalaria juncea.
Agrovoc keywords:
EnglishCajanus cajanhttp://aims.fao.org/aos/agrovoc/c_1185
EnglishCrotalaria junceahttp://aims.fao.org/aos/agrovoc/c_1978
EnglishOrganic agriculturehttp://aims.fao.org/aos/agrovoc/c_15911
EnglishBiological controlhttp://aims.fao.org/aos/agrovoc/c_918
Subjects: Farming Systems
Crop husbandry > Production systems > Cereals, pulses and oilseeds
Research affiliation: Brazil > Other organizations
Related Links:http://www.scielo.br/?lng=pt
Deposited By: Pinto, Gabriela Franco
ID Code:22722
Deposited On:21 May 2013 15:28
Last Modified:21 May 2013 15:28
Document Language:English
Refereed:Peer-reviewed and accepted

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