Locusts' invasion has been a major threat to crop plants and overall food security across the globe. Crop damage by locusts is even more threatening and devastating due to global pandemics such as COVID-19. Recently, the locust's attack has caused major damage to the agricultural and food crops and the value of this damage is estimated to cross billions of dollars. Although these locusts and grasshoppers are major feeders of crop plants, at the same time their populations are also important to maintain ecosystem functioning and balance. However, their overpopulation in certain seasons 120can cause major destruction of growing crops. Therefore, it is significantly important to check their populations, feeding activities, habitats, and crop damage in various regions so that effective management measures and strategies can be devised as per requirements and extent of the problem. The control and management measures mentioned in this chapter can greatly help the farmers and researchers to minimize the locust's invasion to achieve food security on a sustainable basis.

Pollen stainability was found to be more or less similar in long petioled form (LPs) and short petioled form (SPs) of water hyacinth but the size of both oval and round pollen grains was bigger in SPs in comparison to the LPs, the difference being statistically significant. In seed development, significant differences were observed between LPs and SPs at 1 % level only in respect of their average number of capsules and seeds in case of natural pollination. However, in case of artificial self and crosspollinated flowers, significant differences were observed between LPs and SPs at 1 % level in respect of their average number of capsules, seed-bearing capsules and also number of seeds per capsule. Bangladesh J. Sci. Ind. Res. 41(3-4), 189-202, 2006