Rice yellow mottle virus (RYMV) is specific to Africa and has been reported in some countries in East Africa and almost all the countries in West Africa. At present, it is undoubtedly the most important disease of rice in Tanzania. It was first reported in the 1980's. It has spread fast and is now...

The resistance of some indigenous soyabean lines to yellow mosaic virus [mung bean yellow mosaic bigeminivirus], transmitted by Bemisia tabaci, was evaluated in the field in New Delhi, India, during kharif 1996-98. Four lines, PK-1189, PK-1180, SL-443 and SL-444, were consistently the most...

This is the first report on the occurrence of citrus leprosis rhabdovirus and its mite vector, Brevipalpus phoenicis (Acari: Tenuipalpidae) at Paraíso do Tocantins, Tocantins State, Brazil. This mite was also observed in the North of Mato Grosso State.

In 1992-93, soyabean cv. Itiquira plants with mottled leaves were found in Planaltina, Distrito Federal, Brazil. The causal agent was isolated and identified as bean pod mottle comovirus (BPMV). The isolate (BPMV-C) was artificially transmitted to soyabeans and 7 other leguminous species, producing ...

In order to understand the various factors which affect beet mosaic potyvirus epidemics, different aspects of the relationships between the virus, its vectors and sugarbeet were studied. The latency and incubation periods, determined under growth chamber and field conditions (in Wageningen,...

A bacilliform virus from Dioscorea alata, designated Dioscorea alata bacilliform virus (DaBV), from Barbados and West Africa and from other Dioscorea spp. from West African, Carribean, Asian and South American countries, was characterized. The virus was transmitted by the mealybug, Planococcus...

Two diagnostic assays involving the polymerase chain reaction (PCR) were evaluated to detect and quantify phytoplasma in aster leafhoppers, Macrosteles quadrilineatus. One assay was used to detect the pathogen in individual insects and monitor the number of insects carrying the pathogen. The other...

Arthropods (including Lepidoptera, Coleoptera and Hemiptera) were collected from flowering dogwoods (Cornus florida) infected with Discula destructiva, the causal agent of dogwood anthracnose, to evaluate their ability to transport viable conidia. During 1994, 7.2% of all arthropods collected...

An evaluation of several black currant (Ribes nigrum) cultivars recommended or suggested as indicators for reversion disease, showed Baldwin to be the most sensitive. Kentish Hero and Silvergieters Schwarze were almost as sensitive as Baldwin, but Ojebyn did not express definitive symptoms. A...

Experimental transmission of European stone fruit yellows phytoplasma to Japanese plum cv. Ozark Premier was achieved using Cacopsylla pruni, caught in the field or raised on infected plants under controlled conditions. Using different groups of infectious psyllas, 89% of the inoculated test plants ...