aphids are sucking juice of the apple-tree and ants is pasturing them. pests in the garden

agricultural agriculture ant aphid aphididae aphidina aphidoidea aphids aphis appletree attack background bite blue bug bugs close colony common crowd crowded damage elder entomology environment farming feed flock formicidae garden gardening graze hemiptera heteroptera homopterous insect insects invasion kill nutriment outdoor parasite pasture pest predator sap sky stalk stem suck sucking suction the varmint vermin