In Wisconsin, vegetable crops are threatened annually by the aster yellows phytoplasma (AYp), which is obligately transmitted by the aster leafhopper. Using a multiyear, multilocation data set, seasonal patterns of leafhopper abundance and infectivity were modeled. A seasonal aster yellows index (AYI) was deduced from the model abundance and infectivity predictions to represent the expected sea...

This paper provides an updating of information a selected number major phytoplasma diseases forest trees, with focus on the associated taxa. Phytoplasma trees have been less extensively studied than those affecting fruit trees. Research role phytoplasmas as cause has only in last few years intensified, after sensitive and specific detection methods greatly based PCR technology became available....

Grapevine “bois noir”, related to the presence of ‘Candidatus Phytoplasma solani’ (‘Ca. P. solani’), represents a serious threat in several vine-growing areas worldwide. In surveys conducted over two years, mild and/or moderate symptoms and lower pathogen titer were mainly associated with ‘Ca. strains harboring secY gene sequence variant (secY52), whereas severe higher observed grapevines infec...

The witches’ broom disease of lime trees is a destructing disease caused by the bacterium Candidatus <span style="font-variant: normal; fon...

In Wisconsin, vegetable crops are threatened annually by infection of the aster yellows phytoplasma (AYp), the causal agent of aster yellows (AY) disease, vectored by the aster leafhopper, Macrosteles quadrilineatus Forbes. Aster leafhopper abundance and infectivity are influenced by processes operating across different temporal and spatial scales. We applied a multilevel modeling approach to p...

"Candidatus Phytoplasma pruni" strain CX, belonging to subgroup 16SrIII-A, is a plant-pathogenic bacterium causing economically important diseases in many fruit crops. Here, we report the draft genome sequence, which consists of 598,508 bases, with a G+C content of 27.21 mol%.

Flavescence dorée (FD) is the most threatening grapevine yellows (GY) disease in Europe. Despite strict control measures, alarming signs of spread viticultural areas continue to be detected. FD attributed infection by phytoplasma strains an incidentally cited species, ‘Candidatus Phytoplasma vitis’. In 2017, a GY field survey was carried out traditional viticulture Tuscany, central Italy. (FDp)...

Phytoplasma PoiBI is responsible for free branching in poinsettia (Euphorbia pulcherrima Wild. ex. Klotzsch). In this study, PoiBI was transmitted by dodder from poinsettia to crown-of-thorns (E. milii Des Moulins) in one out of ≈100 attempts, whereas grafting transmission was unsuccessful. PoiBI was shown to be viable in E. milii, as it was detected in the recipient plant and in its cuttings o...