Insects crave salt and search grasslands for the limiting nutrient. A new study examines the nutritional preferences of diverse insect communities from Texas to Minnesota. The team conducted 54 experiments in both grazed and ungrazed grasslands to determine the salt cravings of insects and the types of insects that crave salt. The team found that insects not only crave salt, but will search for it in their grassland habitats. Source 6y.
Insects look for a lot of minerals, sugars and even salt for their little kingdom - you'll mostly know ants to be the most efficient for all of these. However, despite this, plants doesn't need salt and tries to get rid of them.