Consumo de Uroleucon ambrosiae (Thomas, 1878) (Hemiptera: Aphididae) por larvas de Chrysoperla externa (Hagen, 1861) (Neuroptera: Chrysopidae) em casa-de-vegetação

Abstract

RESUMOABSTRACT The objective of this research was to evaluate the consumption of Uroleucon ambrosiae in different densities by Chrysoperla externa larvae derived from different alimentary regimes, in greenhouse conditions. The 3 rd and 4 th instars nymphs of the aphid were separated in the densities 30, 40, 50 and put on the lettuce plants (35 days old) which were kepted in a voil cage of 27x27x26 cm connected to the PVC tube used for hydroponic cultivation. After four hours, one larva of C. externa previously fed with U. ambrosiae or eggs of Sitotroga cerealella (Olivier, 1819) was released near the aphid colony, with the lettuce plant being immediately covered. The same procedure was adopted without confinement of the larvae. The different instars of C. externa were evaluated, through counting of the aphids after forty eight hours. The efficiencies of the predator, confined in a cage, were 12.46, 13.63 and 25.76% for 1 st , 2 nd and 3 th instars which were previously fed with eggs of S. cerealella. For 2 nd and 3 rd instar larvae fed with aphids, the efficiencies were 9.59 and 17.63%, respectively. Efficiency was 18.62% for 3 th instar larvae fed previously with eggs of the lepidopterous in the 1 st instar and with nymphs of aphids in the 2 nd ínstar.

Ocorrência de insetos-praga e inimigos naturais no cultivo de alface Lactuca sativa L. (Asteraceae) em sistema de aquaponia e influência de dieta floral sobre Eriopis connexa (Germar) (Coleoptera: Coccinellidae)

“…Entre os predadores destacam-se as joaninhas (Coleoptera: Coccinellidae), cujas larvas e adultos alimentam-se de pulgões; seguido pelos crisopídeos (Neuroptera: Chrysopidae) e sirfídeos (Diptera: Syrphidae) que apresentam hábito predatório durante a fase larval ( VAN EMDEN & HARRINGTON, 2007). Esses três grupos de inimigos naturais apresentam potencial como agentes de ação no controle populacional de pulgões em alface (AUAD et al, 2003a;PRETORIUS et al, 2010;NELSON et al, 2012;FARSI et al, 2014).…”

“…No Brasil, pesquisas relacionando a ação de predadores sobre pulgões na cultura da alface foi realizado por Auad et al (2003a;2003b)…”