But its actually an effective method of trellising tomatoes if you plant your tomatoes in rows. Trellising Tomatoes With the Florida Weave. 2014. How Long Build up your ladybug, hover fly and lacewing populations by having a spray free environment and providing year round nectar and wild areas for habitat. Check every plant that you buy or get given for the eggs, nymphs and sugars. Crop covers are very successful, but expensive and for tomatoes make life tricky re regular management. Corn Gluten.A pre-emergent weed killer or one that kills weed seeds, the Corn Gluten is a by product of corn. It has only been recently used as a weed killer, previously being distributed as food for farm animals.