Occurrence of powdery scab like disease of potato tuber caused by <I>Phytophthora infestans</I> f. sp. <I>infestans</I> WATERHOUSE

DISS. ETH No. 20653 GLOBAL POPULATION GENETICS OF SPONGOSPORA SUBTERRANEA F. SP. SUBTERRANEA, THE PLASMODIOPHORID PATHOGEN CAUSING POWDERY SCAB OF POTATO AND ITS IMPACT ON DISEASE MANAGEMENT

Occurrence of Parthenogenesis in Potato Tuber Moth

Parthenogenesis, a natural form of asexual reproduction produced from unfertilized eggs, occurs in many insects in Hemiptera and Hymenoptera, but very rarely in Lepidoptera. The current study aimed to test the larval density dependent occurrence of parthenogenesis in potato tuber moth, Phthorimaea operculella (Zeller; Lepidoptera: Gelechiidae) under laboratory conditions. More than 10% of femal...

Common Scab of Potato as Affected by Soil Mineral Elements and Tuber Chemical Constituents

During 2009/2010 growing season, a survey was conducted in three regions where potato was intensively cultivated in three different governorates. These were ElNubaria, El-Salheya and El-Sheikh Zaied in El-Behera, ElSharkia and El-Ismailia governorates respectively. The causal common scab isolates of Streptomyces scabies recovered were isolated from potato tubers showing different scab symptoms ...

Foliar Treatments of 2,4-Dichlorophenoxyacetic Acid for Control of Common Scab in Potato Have Beneficial Effects on Powdery Scab Control

Prior studies have shown that applications of the synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D) to the foliage of potato plants can reduce common scab. Here field and glasshouse trials suggest that 2,4-D foliar treatments may also reduce the biologically distinct tuber disease, powdery scab. Significant correlations between suppression of common and powdery scab from the field trials s...

Global Genetics and Invasion History of the Potato Powdery Scab Pathogen, Spongospora subterranea f.sp. subterranea

Spongospora subterranea f. sp. subterranea (Sss) causes two diseases on potato (Solanum tuberosum), lesions on tubers and galls on roots, which are economically important worldwide. Knowledge of global genetic diversity and population structure of pathogens is essential for disease management including resistance breeding. A combination of microsatellite and DNA sequence data was used to invest...