The term CROP DESTROYER can be broken down into two crossword solutions, HAIL (4 letters) and ROOTROT (7 letters). HAIL is a form of precipitation that consists of balls or irregular lumps of ice falling from a cumulonimbus cloud. It can cause significant damage to crops, especially when it is accompanied by strong winds. ROOTROT is a type of fungal disease that affects the roots of plants, causing them to rot and die. It is often caused by poor drainage, over-watering, or a lack of air circulation around the roots. Both HAIL and rootrot can cause significant damage to crops, making them effective crop destroyers.