Changes in the proportion of benzimidazole‐resistant strains in populations of Venturia nashicola were monitored in pear orchards. Successive applications of thiophanate‐methyl increased the level of resistance in the populations. When the application of benzimidazoles was stopped and other fungicides were applied, the proportion of highly resistant strains gradually decreased and the proportion of intermediately resistant, weakly resistant and sensitive strains increased. It is suggested that this phenomenon is an example of genetic homeostasis within microbial populations.
Apple chlorotic leafspot virus (CLSV) type strain isolated from an apple tree was back-transmitted to 8-day-old apple seedlings by rub-inoculation with partially purified and highly purified inoculum.The back-transmitted isolates induced typical apple topworking disease symptoms on a clone of Maruba Kaido (Malus prunifolia Borkh. var. ringo Asami) infected with other latent viruses (including the Maruba CLSV strain) as well as on a virus-free clone.The back-transmitted isolates induced symptoms identical to the parent isolate on a range of CLSV-sensitive indicator plants.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.