slug pest attack on chard leaves in the vegetable garden. red or brown slug eating leaves

red slug slugs snail invasion pests garden brown mollusk pest gastropod leaf invertebrate soil ecology gastropoda disease grow rotten cabbage crawling gardening lettuce insect creep farmer damaged closeup plot leaves crops crop control snails pumpkin invasive land species spanish diseases caterpillar damage lusitanicus snailplage europe chocolate arion attack chard vegetable garden eating