Effectiveness of entomopathogenic bacteria, Xenorhabdus nematophila and Photorhabdus temperate against sawtoothed grain beetle, Oryzaephilus surinamensis
Potential of entomopathogenic bacteria againt sawtoothed grain beetle, Oryzaephilus surinamensis
DOI:
https://doi.org/10.55627/zoobotanica.002.02.0627Keywords:
Phonix dactylifera, Oryzaephilus surinamensis, Xenorhabdus nematophila, entomopathogenic bacteria, Photorhabdus temperateAbstract
Oryzaephilus surinamensis (Coleoptera: Silavinidae) is considered as one of the major insect pest under stored product conditions all over the globe. It causes severe damage such as weight loss and the stored products are reducing their quantity and quality. The effectiveness of Xenorhabdus nematophila and Photorhabdus temperate was studied against Oryzaephilus surinamensis in the current study. Total eggs laid by O. surinamensis are significantly reduced by all concentrations of X. nematophila and P. temperate and adults’ number as compared to the control. The higher concentrations gave the higher reduction and vice versa. In the same way, total number of bacteria regarding inhibition of O. surinamensis F1 adult’s emergence gave statistically significant results. The highest bacterial concentration of 1× 108 cells per ml showed maximum rate of inhibition and minimum rate of inhibition was noted in 1× 104 cells per ml. There was a direct relation between inhibition rate and concentration. On the other hand, the days to 100% mortality of F1 adults of O. surinamensis that were fed on dates treated with the highest concentration of P. temperate and X. nematophila were nearly equal. On another side, highest damage was observed by the insects in the dates treated with 1 × 104 cells per ml. In the same way, concentrations of 1 × 105, 1 ×106 and 1 × 107 cells per ml results in higher loss of weight to the stored dates. Similarly, all concentrations of X. nematophila and P. temperate have caused mortality of O. surinamensis significantly as compared to the control. There is a direct relation between insects’ mortality and concentrations. The maximum mortality was observed at 1 × 108 cells per ml concentration and the minimum at 1 × 104 cells per ml. The current study will have significant effect on formulation of microbial development of P. temperate and X. nematophila to control O. surinamensis in stored dates.
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