The fumigant MITC is a breakdown product of?

The fumigant MITC, which stands for methyl isothiocyanate, is indeed a breakdown product of metam sodium. When metam sodium is applied to soil, it undergoes hydrolysis and thermolysis, resulting in the release of MITC as one of the active compounds. This transformation is significant in pest control because MITC is effective against a variety of pests, including nematodes and soil-borne diseases, making it an important tool in non-soil fumigation practices.

The other options listed do not produce MITC as a byproduct. Ethylene oxide is a different chemical used primarily as a sterilant, while fosetyl-Al is a systemic fungicide that works by different mechanisms, and bromomethane (also known as methyl bromide) is a different fumigant altogether with its own unique action and breakdown products. Therefore, understanding the specific breakdown of metam sodium leading to MITC is crucial for effective pest management and regulatory compliance in non-soil fumigation.