Tempo de busca e de manuseio de larvas de Chrysoperla externa (Hagen, 1861) (Neuroptera, Chrysopidae) alimentadas com Uroleucon ambrosiae (Thomas, 1878) (Hemiptera, Aphididae)

Abstract

ABSTRACT. Searching and handling time of Chrysoperla externa (Hagen, 1861) (Neuroptera, Chrysopidae) larvae fed on Uroleucon ambrosiae (Thomas, 1878) (Hemiptera, Aphididae). The objective of this research was to determine the searching and handling times of three larval instars of C. externa fed on U. ambrosiae at densities of 30, 40 and 50 per vial, with the feeding of the larvae at the preceding instars being U. ambrosiae nymphs or Sitotroga cerealella (Olivier, 1819) eggs. The larvae were maintained at 25 ± 2 ºC, 70 ± 10% RH and a 14-h photophase. A completely randomized design in a 6 x 3 factorial scheme with 12 replicates was adopted. The shortest searching time was found for the 2 nd and 3 rd instar larvae of C. externa, and this parameter was variable depending on the feeding given to the larvae previously. The handling time was similar for the 1 st , 2 nd and 3 rd instar larvae. The longest searching time was found at an aphid density of 30, as compared to densities of 40 and 50 prey, with which there were no significant differences. Prey density did not have any influence on handling time.

Predation of Ceraeochrysa cubana (Hagen) (Neuroptera: Chrysopidae) on Hyadaphis foeniculi (Passerini) (Hemiptera: Aphididae)

“…The handling time of C. externa larvae fed by U. ambrosiae, determined by Auad et al (2002), under similar conditions, was higher to that found in this study for all green lacewing instars, which may indicate that the C. cubana species can be considered an excellent biological controlling agent of H. foeniculi.…”

“…In the second instar of C. cubana, there was no statistical difference in searching time as a function of feeding in the preceding larva stage (Table 4), as observed by Auad et al (2002), who studied the searching time for Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae) in Uroleucon ambrosiae (Thomas) (Hemiptera: Aphididae). The same result was found in the third instar of the predator, where no significant difference was observed in the searching time regarding the food used in previous instars.…”

“…To this end, the relation between density and number of prey to be consumed is a fundamental aspect of the predator-prey dynamics, because depending on their density, prey can be used by natural enemies in different proportions and thus cause changes in the predator population. Another way of assessing the effectiveness of natural enemies in pest control is to determine the search and handling time, since the time spent by the predator to consume food is a factor that interferes with its search ability (Auad et al, 2002).…”

Functional Response of Chrysoperla externa, Chrysoperla rufilabris, Ceraeochrysa sp. nr. Cincta, and Ceraeochrysa valida (Neuroptera: Chrysopidae) as Natural Enemies of Diaphorina citri (Hemiptera: Liviidae)

“…The functional response identified (Type II) is similar with the response identified by Fonseca et al (2000), Auad et al (2001), Castro et al (2016) and Palomares-Pérez et al (2019), who mention that C. externa presented a Type II functional response when feeding on Schizaphis graminum (Rondani), Uroleuconambrosiae (Thomas) (Hemiptera: Aphididae), Trialeurodes vaporariorum Westwood (Hemiptera: Aleyrodidae) and Melanaphis sacchari (Zehntner) (Hemiptera: Aphididae) respectively. Similarly, C. rufilabris presents the same functional response when feeding on Aphis gossypii Glover (Homoptera: Aphididae) and Rhinocapsus vanduzeei Uhle (Hemiptera: Miridae).…”

TOXICIDAD DEL EXTRACTO ACUOSO, ETANÓLICO Y HEXÁNICO de Annona muricata, Minthostachys mollis, Lupinus mutabilis, Y Chenopodium quinoa SOBRE Tetranychus urticae Y Chrysoperla externa

“…Entre los insectos, Chrysoperla externa Hagen 1861, "león de áfidos", es un depredador eficaz en el manejo ecológico e integrado de plagas, pudiendo habitar un gran número de agroecosistemas (Núñez, 1988;Aud et al, 2001;Iannacone et al, 2007). Las larvas son muy voraces y se alimentan preferentemente de insectos de cuerpo blando (Soto y Iannacone, 2008).…”