Powderymildew caused by Leveillula taurica (Lév) G. Arn. is a quite serious disease of pepper varieties (Capsicum spp.) worldwide. The use of resistant genotypes can control the disease. Best control of pepperpowderymildew in the greenhouse was obtained with applications of myclobutanil, triflumizole, pyraclostrobin + boscalid, quinoxyfen, strobilurin derivatives (azoxystrobin, trifloxystrobin, kresoxim-methyl), copper soap, JMS Stylet-Oil®, Valent-10118... Position of Leveillula taurica resistance loci on the pepper genome and their syntenic position with tomato powderymildew resistance loci. Chromosome numbers are indicated as P for pepper and T for tomato. Leveillula taurica, the powderymildew that attacks peppers and more than 1 000 other species is a unique fungal disease in that it is an endoparasite. It grows within the leaf and not on the leaf as do all other forms of powderymildew. Powderymildew is a fungal disease in plants that is commonly seen in warm, dry climates and causes a white-gray, powdery substance to appear on leaves. Several different species of fungi can cause powderymildew. In this paper, one of the endoparasitic powdery-mildew fungi, Leveillula taurica (Lev.) Arn., on green pepper (Capsicum annuum L. var. angulosum Mill.) leaves was investigated by light and electron microscopy. How to Identify PowderyMildew. Plants infected withpowderymildew look as if they have been dusted with flour. Powderymildew usually starts as circular, powdery white spots, which can appear on leaves, stems, and sometimes fruit. Powderymildew can occur on peppers in a dry or humid climate because the conidia of L. taurica can germinate and develop a germ tube under any level of relative humidity (RH) from 0-100% if temperatures are between 18-33°C (64-91°F) (Goldberg 2003, Basler and Lang 2012). Don’t Confuse Downy MildewwithPowderyMildew!Exceptions include strawberry and pepperpowderymildew, which produce spots on the lower leaf surface, and cucumber powderymildew, which forms spots on both the upper and lower surfaces of leaves.
