Genetic variation in plants is known to influence arthropod assemblages and species interactions. However, these influences may be contingent upon local environmental conditions. Here, we examine how plant genotype-based trophic interactions and patterns of natural selection change across environments. Studying the cottonwood tree, Populus angustifolia, the galling aphid, Pemphigus betae and it...

Cotton leafroll dwarf virus (CLRDV) is an introduced Polerovirus (Family: Solemoviridae) of cotton, Gossypium hirsutum L., in the U.S. The only vector known to transmit this cotton aphid, Aphis gossypii Glover; however, there are seven other species aphids (Hemiptera: Aphididae) reported colonize southeastern U.S.: Protaphis middletonii (Thomas), Rhopalosiphum rufiabdominale (Sasaki), craccivor...

The article continues a series of critical reviews the species composition powdery mildew fungi (Erysiphaceae, Helotiales, Ascomycota) Ukraine and their distribution within country. This deals with section Microsphaera genus Erysiphe. These are distinguished by fruiting bodies that have non-mycelioid appendages dichotomously branched apices. A list 36 recorded in regions is provided, as well ke...

Beet necrotic yellow vein virus (BNYVV) is a member of the genus Benyvirus (21,22) and causes the disease known as rhizomania. It often is reported to be the most important sugar beet (Beta vulgaris L.) virus (17). BNYVV is transmitted by the plasmodiophorid, Polymyxa betae Keskin (1,2,6). In the United States, the virus first was identified in California in 1984 (5) but now occurs in every maj...