two brown slugs crawling on wet, green leaves in a garden, with visible holes from slug feeding

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 two wet green visible holes from feeding highlighting natural behavior rain-soaked shiny textured show signs tears emphasizing slugs#39aph39# interaction plant life