Title : Mixture of plant extracts for the management of the bean weevil Acanthoscelides obtectus
Abstract:
Acanthoscelides obtectus weevil is an insect that affects the physical, nutritional and physiological quality of bean seeds and other legumes. Its management is based on the indiscriminate use of chemical insecticides, such as aluminum phosphide, which cause damage to the environment and to people's health. As an alternative, in the present work the ethanolic extracts of tree tobacco Nicotiana glauca Graham were evaluated and cacachila Karwinskia humboldtiana (Shult.) Zucc. at different concentrations (5, 10 and 15 % w/v), independently and in a mixture. The results indicate that there are significant differences between treatments, being statistically superior: tree tobacco 15 % + cacachila 15 % and tree tobacco 15 % + cacachila 10 % when inducing a mortality of 78 %, seed damage and emergence in the F1 of 0 %. The use of the extracts of tree tobacco and cacachila at 15 % is recommended independently, because their efficacy was similar, completely inhibiting the damage and emergence, only with a slight disadvantage in terms of mortality, which ranged between 69 and 72 %, but using less plant material, for its preparation.
