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Insects and Plant Diseases
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Leafhoppers
Known for spreading phytoplasmas leading to diseases such as Aster yellows; can cause yellowing and dwarfing of plants.
Scale insects
Can spread fungal diseases due to honeydew production, facilitating growth of sooty molds on plants.
Emerald ash borer
Does not transmit diseases, but causes dramatic damage to ash trees, leading to tree death and increased wood decay pathogens.
Japanese beetle
Does not transmit diseases but causes significant direct damage including skeletonized leaves and defoliation.
Thrips
Vectors for Tospoviruses like Tomato spotted wilt virus; cause silvering of the leaf surface, stunted growth.
Fruit flies
Specific species like Olive fruit fly can transmit bacteria and fungi like Pseudomonas syringae, leading to plant rot.
Asian citrus psyllid
Vector of the bacterium that causes citrus greening disease (Huanglongbing), leading to misshapen, bitter fruit.
Spider mites
Not true insects, but can cause damage and stress that may lead to fungal or bacterial infections in plants.
Aphids
Transmission of plant viruses like Cucumber mosaic virus; cause sooty mold development due to honeydew excretion.
Mealybugs
Spread of viruses like Grapevine leafroll-associated virus and can cause growth issues due to sooty mold from honeydew.
Beet leafhoppers
Act as vectors for the Beet curly top virus causing severe stunting and leaf curling in many plant species.
Planthoppers
Transmit phytoplasmas and rice viruses causing diseases like Rice Ragged Stunt and Rice Grassy Stunt.
Corn rootworm
Mainly causes physical damage to roots and stems, leading to secondary infections by pathogens in weakened plants.
Colorado potato beetle
Primarily a defoliator, not a disease vector; however, its damage can predispose plants to secondary infections.
Whiteflies
Spread of Begomovirus affecting tomatoes and other crops; induce plant disorders like Tomato yellow leaf curl.
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