Sub-Lethal Effects of Bacillus Thuringiensis and Methoxifenozide, Over the Number of Eggs and Adults Longevity of Condylorrhiza Vestigialis (Lepidoptera: Crambidae) in Brazil

Objective: The objective of this study is to investigate the sublethal effects of Bacillus thuringiensis and Methoxyfenozide on the number of eggs and longevity of Condylorrhiza vestigialis under laboratory conditions, with the aim of reducing insect populations under field conditions. Theoretical Framework: It is based on the need to control an important pest of the Álamo culture. Method: The C. vestigialis pupae used in the experiment were obtained from mass rearing. Three treatments were used: T1 – Methoxyfenozide; T2 – B. thuringiensis and T3 – Distilled and sterilized water. To carry out the evaluations, the pupae were submerged in insecticide solutions for two different periods of time, three and five minutes. For each treatment, four couples were used, and the egg count was always done during the change of bond paper and ended after the death of the females. Results and Discussion: The dose of Bt tested did not indicate sub-lethal effects that could affect the longevity of adults, fertility and the number of eggs in females; The tested dose of Methoxyfenozide showed sub-lethal effects that reduce the longevity of C. vestigialis adults, the survival of adults during the longest pupal immersion time and the total number of eggs; Hormesis was verified for the dose of Bt that showed an increase in the total number of eggs during the longest immersion time. Research Implications: Provide results to be applied to control the pest in the field as well as stimulate new research related to the topic. Originality/Value: The relevance and value of this research are evidenced by the future possibility of treating pupae of this insect under laboratory conditions.