AFRICAN VIOLET (Saintpaulia )BACTERIAL Leaf Blight. Pseudomonas sp., OR.BLIGHT, Gray Mold. Botrytis cinerea, cosmopolitan.NEMATODE, Leaf. Aphelenchoides ritzemabosi; Lesion, Pratylenchussp., MD, NJ, OH.NEMATODE, Root Knot. Meloidogyne arenaria, general.NEMATODE, Spiral. Scutellonema brachyurus, MD.NONPARASITIC. Ring Spot, due to wetting foliage with cold water, general;Petiole Rot, from touching rim of salt-encrusted pot.POWDERY MILDEW. Oidium sp., occasional in greenhouses.ROT, Root. Rhizoctonia solani; Fusarium solani, MD, NY; Cylindrocarponradicicola, MD, NY.ROT, Root and Crown. Pythium ultimum, CA, probably general; Phytophthorasp., MD, NC.Bright yellow ring patterns appear if there is too steep a temperature gradientbetween leaf and water. Yellowing may be due to excessive bright sunlight.Non-flowering may be due to improper light. Root-knot nematodes as wellas mites causes thickened, blistered leaves.

GLOXINIA (Sinningia )BACTERIAL Leaf Blight. Pseudomonas sp., OR.BACTERIAL Leaf Spot. Pseudomonas alcaligenes, FL.BACTERIAL, MLO. Aster Yellows, CA.BLIGHT, Bud Rot. Botrytis cinerea, CA, MO.NONPARASITIC. Dieback Wilt; Boron deficiency, CA.ROT, Crown; Flower, Leaf Blight. Sclerotinia sclerotiorum, CA.ROT, Leaf. Cladosporium herbarum, NJ.ROT, Root and Crown. Phytophthora cryptogea, CA; Pythium ultimum,CA; Myrothecium roridum, FL.VIRUS. Tomato Spotted Wilt, CA, MO, NC, TX; Tobacco Mosaic, CA,CT, DC, FL, OH, WA; Impatiens Necrotic Spot, NC.

RUBBER-PLANT (Ficus elastica )ANTHRACNOSE. Glomerella cingulata, general; Gloeosporium sp., WA.BACTERIAL Crown Gall. Agrobacterium tumefaciens, CA, TX.CANKER; DIEBACK. Physalospora rhodina, GA.LEAF SPOT. Alternaria sp., IN, OH, TX; Leptostromella elastica, NY,Northeastern states; Mycosphaerella bolleana, GA; Phyllosticta sp.,MD, NY; Phyllosticta roberti, Gulf states, MD, NY; Stemphyliumelasticae, secondary; Trabutia (Phyllachora) ficuum, black spot, FL.NEMATODE, Leaf. Aphelenchoides besseyi, FL.NEMATODE, Root Knot. Meloidogyne spp.; M. incognita.NEMATODE, Spiral. Helicotylenchus nannus.

VINCA (Periwinkle, Ground-Myrtle)BACTERIAL, MLO. Aster Yellows, KS, TX.BACTERIAL Stunt. MLO, AR, OK.BLIGHT, Gray Mold. Botrytis cinerea, CT,WA.BLIGHT, TWIG. Colletotrichum dematium, FL.CANKER; DIEBACK. Phomopsis lirella, CT, MD, NJ, OH, PA, VA; Phomasp., OR.DODDER. Cuscuta indecora, TX.FLOWER, Spot and Blight. Choanephora cucurbitarum, LA.LEAF SPOT. Alternaria sp., PA, TX; Colletotrichum sp., FL; Macrophomavincae, also dieback, IL, NY; Phyllosticta sp., CT, GA, NJ;P. minor, MD, NJ, NY, VA; P. vincae-majoris, CA; Septoria vincae,NJ, NY; Volutella vincae, NY, PA.MOLD, Leaf. Cladosporium herbarum, ME, NY, PA.NEMATODE, Dagger. Xiphinema americanum, WI.

NEMATODE, Root Knot. Meloidogyne sp., CA, KS, OH.ROT, Root. Phytophthora cactorum, NC; P. lateralis, NC.ROT, Root, Black. Thielaviopsis basicola, FL.ROT, Root and Stem. Rhizoctonia solani, IL,MD, NJ, PA. Phytophthoraparasitica, MD.RUST. Puccinia vincae (0, I, II, III), MA, MI, NY, WA.SPOT, Target. Corynespora cassiicola, FL.VIRUS. CucumberMosaic, NJ; Potato Yellow Dwarf, CA; Tomato SpottedWilt-Impatiens Serotype, FL, GA.WILT. Verticillium albo-atrum, CA, OR

BEGONIABACTERIAL Crown Gall. Agrobacterium tumefaciens, CT,MS, TX.BACTERIAL Spot. Xanthomonas begoniae, general.BLIGHT, Gray Mold. Botrytis cinerea, cosmopolitan.LEAF SPOT, Anthracnose. Gloeosporium sp., FL, LA, MA, MS, NJ, TX;Cercospora sp., FL, GA, MS, NJ, TX; Penicillium bacillosporium,secondary; Phyllosticta sp., NJ, PA.NEMATODE, Leaf. Aphelenchoides fragariae, cosmopolitan in greenhouses;Lesion, Pratylenchus sp.NEMATODE, Root Knot. Meloidogyne spp., cosmopolitan in gardens in theSouth, greenhouses in the North.NONPARASITIC. Oedema. A water-soaked spotting, frequent in houseplants.POWDERY MILDEW. Golovinomyces cichoracearum, CA; Oidium sp.,CA, FL, NC; Oidium begoniae, OH.ROT, Root. Armillaria mellea, CA; Thielaviopsis basicola, MA, OH.ROT, Root and Stem. Pythium spp., CA, MO; Rhizoctonia solani, cosmopolitan;Sclerotinia sclerotiorum, CA: Sclerotium rolfsii, IL.VIRUS. Impatiens Necrotic Spot, NC; Tomato Spotted Wilt, CA, MO,

OK, TX; Broad Bean Wilt, MN.WILT. Verticillium albo-atrum, CT,NY; Fusarium foetens, CT.The dry air of the average living room keeps leaf diseases at a minimum.Overwatering may foster root rots and physiological oedema. In greenhousesBotrytis blight, bacterial spot, leaf nematode, and Pythium rots may becomeproblems. Powdery mildew is serious on tuberous begonias.