EFFECTS OF ARTIFICIAL DIETS ON THE BIOLOGICAL CYCLE OF Condylorrhiza vestigialis

Cacilda João Chirinzane,Veruza Cristina Mendonça,Nilton José Sousa,Eduardo Henrique Rezende,Marcos Giongo,Antonio Carlos Batista

doi:10.5380/rf.v51i1.67580

Cacilda João Chirinzane, Veruza Cristina Mendonça + Show 4 more

Open Access

https://doi.org/10.5380/rf.v51i1.67580

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Abstract

The objective of this work was to determine the influence of different artificial diets on biological parameters related to the life cycle of C Condylorrhiza vestigialis aiming to determine the most suitable diet for the rearing of a population of this insect. Four diet formulations were tested. Ten repetitions were used, with 30 caterpillars per repetition. All stages of C. vestigialis life cycle were followed to evaluate biological parameters: viability of larvae, pre pupa, pupa and adults, as well as the sex ratio. The number of larval instars, the pupal mass and the total number of eggs per day and per female day were also calculated. The four diets tested allowed the development of C. vestigialis caterpillars. All diets were considered adequate for the purpose of the work, which is the production of baculovirus used in the control program of this pest. It was the diet 2 that provided the best results, the largest pupal mass, and the quantity and viability of the eggs produced by C. vestigialis females fed in this larval phase.

Highlights

Populus deltoides (Álamo), originally from eastern North America, is widely cultivated worldwide for the production of wood, bridge beams, fence posts, afforestation and landscaping
Five homogeneous groups of peaks were observed by analyzing the multimodal frequency curve of the cephalic capsule width of C. vestigialis, indicating the existence of five larval instars (Figure 1)
The five larval instars verified in this work, the duration of the pre-pupa stage of one day, and the duration of the pupa period of 7, 8 days on average, verified in this work are similar to the result found by Campos et al (2017), who tested artificial diets. in the creation of C. vestigialis in the laboratory, using artificial diets

Summary

Introduction

Populus deltoides (Álamo), originally from eastern North America, is widely cultivated worldwide for the production of wood, bridge beams, fence posts, afforestation and landscaping. One of the factors that affect the productivity of P. deltoides is the occurrence of pests, among them the main one is Condylorrhiza vestigialis (Mariposa do Álamo). This insect causes intense defoliation in P. deltoides plants and reduced productivity (MACHADO, 2017). Marques et al (1995), reveal that the poplar moth caused several damages to Populus stands in plantations carried out in southern Paraná, with defoliation levels of up to 100% in the nurseries, and in adult trees, the defoliation level can reach higher levels to 50%. Among the methods of control of C. vestigialis, the use of the fungus Beauveria bassiana is one of the alternatives (POGETTO; WILCKEN, 2012), but the use of the entomapotogenic virus Condylorrhiza vestigialis multiple nucleopolyhedrovirus (CoveMNPV), extracted from the insect itself, is one of the that stand out the most, for its high efficiency characteristic and for being specific for this pest (CASTRO et al, 2009; CASTRO, 2011). With laboratory creations, other studies are feasible, such as those with sexual pheromones, which are already carried out with C. vestigialis (AMBROGUI et al, 2009)

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