garden pest - aphids suck out the nutritious sap of the plant, selective focus

aphid plant hemiptera phytophage parthenogenesis unisexual galls span excretions ants myrmecophilia symbiosis ladybugs pest sucking summer infestation juice natural tiny aphidoidea entomology damage aphis larvae parasite asclepia environment curassavica leafhoppers vermin outdoor agriculture aphids greenhouse seed colorful foliage insects forest food healthy background closeup lacewing buds leaves sap