Laboratory and field evaluation of yeast-based baits for fruit flies, Bactrocera occipitalis (Bezzi) and B. philippinensis Grew and Hancock (Diptera:Tephritidae)
2011
Tomambo, R.D.
The effect of baits prepared from brewery waste, brewer's yeast, baker's yeast and autolysed yeast on fruit flies, Bactrocera occipitalis and B. philippinensis was studied under laboratory and field conditions. In the laboratory, protein deprived flies were subjected to an attractancy experiment in a choice test and a feeding experiment in a no-choice test. Field test was conducted in the UPLB fruit orchard using an improvised trap to evaluate the respective baits in capturing wild population of fruitflies. Baits in the laboratory and field test were correlated to their protein crude content and pH. The attractancy experiment showed that the response of B. occipitalis and B. philippinensis varied with age and sex. Young female and old male flies of both species were attracted most to baker's yeast while their young male counterparts to brewer's yeast. Old female flies of B. philippinensis, on the other hand, were most attracted to autolysed yeast. The feeding experiment showed that baker's yeast as a potential bait for both B. occipitalis and B. philippinensis and that sex and age to bait was not much of a factor. In the field test, autolysed yeast outperformed baker's yeast in capturing wild population of fruit flies from of both sexes and followed by baker's yeast. The variation in the results of the laboratory and field trials could not be attributed to the crude protein analysis and pH of the baits. Autolysed yeast had the lowest crude protein while baker's yeast had the highest. All bait formulations were basic except for brewery waste.
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