Sitophilus zeamais is primarily a stored grain pest of Zea mays. The pest feeds on grains, stem leaves and other plant parts. Although most damage takes during storage but the initial infestation takes place at the field. So, it can be considered as one of the constraint on the stored grains. Many pesticides have been developed to eradicate these pests which are actually good in their work but at the same time it harms the environment too. These pests not only affect the environment but the consumers are also at a higher risk because of this and it may cause the exacerbate pest control.

It is most vigorous pest that reproduces exponentially and damages more than 50-60% of yield. Germination viability, seed weight, and crop’s market value is the prime things affected by this pest. Chemical based pesticides protect the yield BUT it has many harmful side-effects to environment. Bio-pesticides are the best way to eradicate this pest with least to no harmful effect on earth.

The present study has used the extracts from the following medicinal plants i.e. Azadirachta indica, Moringa oleifera (Moringa), Carum copticum (ajwain), Allium sativum and Ocimum sanctum. At an interval of 5 days these extracts were used for 4 times for checking their efficacy against Sitophilus zeamais. When results were observed it showed that Azadirachta indica was most effective with highest mortality of about 97.24% and Carum copticum was least effective with only 43.28% of mortality. However Moringa oleifera and Ocimum sanctum showed fewer efficacies than Azadirachta indica but was still more effective than Allium sativum. Percent infestation reduced drastically when Azadirachta indica was used.