What is a consideration for the presence of plant debris on a fumigation site?

The presence of plant debris on a fumigation site is indeed a significant consideration because it can decrease the effectiveness of fumigants. Plant debris can create an environment that leads to gas sorption, where the fumigant molecules are absorbed by the organic materials instead of interacting with the intended pest organisms. This can result in a reduced concentration of the fumigant available in the airspace, which may prevent it from effectively reaching and controlling pests. Moreover, debris can also contribute to the formation of microenvironments where pests can hide from the fumigant, further diminishing its overall efficacy. Therefore, when planning a fumigation, it is essential to account for plant debris and consider proper site preparation to ensure that fumigants can effectively penetrate and reach the target pest populations.