Evaluation of cashew balm formulations as potential biopesticide to control tephritid fruit fly developmental stages in the soil under laboratory conditions

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10th International Symposium on Fruit Flies of Economic Importance

Tapachula, Chiapas, Mexico April 23 – 27, 2018.

Section 8. Other Control Methods

 

Evaluation of cashew balm formulations as potential biopesticide to control tephritid fruit fly developmental stages in the soil under laboratory conditions

Antonio Sinzogan1, Anato Florence1, Crépin Aniwanou1, & Aimé Bokonon-Ganta1

1 Faculty of Agronomics Sciences, University of Abomey-Calavi; 03 BP 2819 Cotonou, Benin. Email: sinzogan2001@yahoo.fr

 

Background: Fruit damage in mango production by insects pests are mainly due to fruit flies (Diptera: Tephritidae) in tropical Africa. These flies are of increase economic importance since the accidental introduction of the notorious species Bactrocera dorsalis (Hendel) into the continent. Control methods against Tephritid fruit flies target both the juvenile stages in the soil and the adults.

Methods: Laboratory experiments was performed to evaluate the efficiency of cashew balm formulations as potential biopesticides to control late-instar larvae of B. dorsalis in the soil. Cashew balm + alcohol 5 % and cashew balm + soap + water are the cashew balm formulations tested throughout the experiments. Persistence of each formulation was also determined.

Results: The results revealed the susceptibility of the third-instar larvae to the various concentrations (8, 12, 16, 20, 24 and 30%) of each cashew balm formulation applied by contact. The highest concentration 30 % of each cashew balm formulation caused the highest mortality rate of larvae and reduced drastically the emergence rate. Cashew balm + soap + water was found more effective compared to cashew balm + alcohol 5 %. However, none of the various concentrations of cashew balm formulations resulted in significant reduction of the fertility of adults emerged from treated larvae. Persistence test showed that cashew balm +  soap + water was still effective against larvae in soil within one and two weeks at 24 % and 30 % concentration respectively whereas cashew balm + alcohol 5% persisted in soil within one week at 30 % concentration.

Conclusions: The results indicated that the application of cashew balm formulations in soil demonstrates efficient larvicidal activity and reduction of B. dorsalis emergence under laboratory conditions. On the basis of this study, soil application of cashew balm formulations can be a promising and effective control of B. dorsalis and can be combined with other control method to provide an effective integrated fruit fly management strategy.

Key Words: Cashew balm, bio-pesticides, mortality, persistence and oriental fruit fly