Pest
Red Palm Weevil
Rhynchophorus ferrugineusThe red palm weevil, Rhynchophorus ferrugineus, is a highly destructive, quarantine-significant beetle whose larvae tunnel inside palm crowns and trunks. Infestations may remain hidden…
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Plant problem library
Detailed profiles of common plant diseases, pests, nutrient deficiencies and environmental problems.
Pest
Peach weevil
Rhynchites bacchusPeach weevil, Rhynchites bacchus, is a fruit-infesting snout beetle associated mainly with pome and stone fruits in Europe and parts of Asia. Adults feed…
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Pest
Bird Cherry-Oat Aphid
Rhopalosiphum padiThe bird cherry-oat aphid is a small, soft-bodied pest of cereal crops and other grasses. Colonies commonly develop on wheat, barley, oats, rye, triticale,…
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Disease
Rhizopus soft rot
Rhizopus stoloniferRhizopus stolonifer causes a rapidly spreading, watery soft rot of ripe fruits, vegetables, and storage roots, especially after harvest. Infection usually begins in bruises,…
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Disease
Rhizoctonia Diseases
Rhizoctonia solani KühnRhizoctonia solani is a soilborne fungus that causes damping-off, wirestem, root and crown rot, stem and stolon canker, aerial blight, and tuber or fruit…
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Pest
Walnut Husk Fly
Rhagoletis completa CressonWalnut husk fly, Rhagoletis completa, is a tephritid fruit-fly pest of walnuts in many parts of the United States, especially the West. Its larvae…
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Pest
European Cherry Fruit Fly
Rhagoletis cerasi (Linnaeus)European cherry fruit fly, Rhagoletis cerasi, is an invasive tephritid pest that attacks ripening cherries. Females insert eggs beneath the fruit skin, and the…
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Disease
Rhabdocline Needle Cast of Douglas-Fir
Rhabdocline pseudotsugaeRhabdocline needle cast is a fungal disease of Douglas-fir that causes yellow spots, reddish-brown blotches, orange-brown fruiting bodies, and premature loss of current-season needles.…
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Pest
Raspberry Cane Midge
Resseliella theobaldiRaspberry cane midge is a small gall midge whose larvae develop beneath split or wounded bark on raspberry canes. Feeding injuries weaken the cane…
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Disease
Raspberry bushy dwarf virus
Idaeovirus rubi (raspberry bushy dwarf virus; RBDV)Raspberry bushy dwarf virus (RBDV) is a pollen- and seed-borne viral disease of raspberries, blackberries and related Rubus plants. Infected plants may show yellowing,…
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Disease
Ramularia leaf spot of barley
Ramularia collo-cygniRamularia leaf spot is a late-season fungal disease of barley caused by Ramularia collo-cygni. Infected plants may carry the fungus silently before flowering, then…
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Disease
Bacterial Wilt
Ralstonia solanacearum species complexBacterial wilt is a serious vascular disease caused by the soilborne bacterium Ralstonia solanacearum species complex. It commonly affects tomato, potato, eggplant, pepper, tobacco,…
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