Plant Protection Science, 2006 (vol. 42), issue 3
Specialisation of Rhynchosporium secalis (Oud.) J.J. Davis infecting barley and rye
Ludmila Lebedeva, Ludvík Tvarůžek
Plant Protect. Sci., 2006, 42(3):85-93 | DOI: 10.17221/2760-PPS 
Fifty-five isolates of Rhynchosporium secalis from Hordeum vulgare and 34 isolates from Secale cereale were compared for growth on different nutrient media, effect of temperature on growth and morphology of colonies. The pathogenicity of the isolates was assessed on 10 rye varieties, 10 triticale varieties and the susceptible barley variety Gambrinus. The triticale varieties differed in the number of rye chromosomes in the genome. Isozymes of R. secalis isolated from infected leaves of barley and rye were compared. The RAPD-PCR method was used for comparison of isolates on DNA-markers. The analysis indicated two specialised...
Phomopsis pisi - a new species causing pea stem canker
Michal Ondřej, Lenka Odstrčilová, Radmila Dostálová
Plant Protect. Sci., 2006, 42(3):95-98 | DOI: 10.17221/2756-PPS
The new species Phomopsis pisi Ondřej sp. n. (Anamorphic Fungi - Coelomycetes) occurred on stems of pea (Pisum sativum L.) cv. Adept at Šumperk-Temenice (Czech Republic). The fungus caused plants to die at the green maturity stage. The new species differs from Phomopsis pisicola. It differs in the length and width of conidiophores and conidia.
Inheritance of resistance to Fusarium wilt in some sesame crosses under field conditions
Mohamed A. S. El-Bramawy
Plant Protect. Sci., 2006, 42(3):99-105 | DOI: 10.17221/2755-PPS
Lines of two generations (F3 and F4) from 15 crosses were screened for two successive seasons (2004 and 2005) for their reaction to Fusarium wilt disease under natural infection by Fusarium oxysporum f.sp. sesami. There was sufficient variability among all crosses and some lines could be valuable for further breeding programs for wilt disease resistance. Offspring of the crosses P1 × P6, P2 × P4 and P3 × P6 seem to be stable in their reaction to the disease in the years of evaluation, though with some segregation from one generation to another. The...
The sensitivity of flower bud thrips, Megalurothrips sjostedti Trybom (Thysanoptera: Thripidae), on cowpea to three concentrations and spraying schedules of Piper guineense Schum. & Thonn. extracts
Alphonsus Mbonu Oparaeke
Plant Protect. Sci., 2006, 42(3):106-111 | DOI: 10.17221/2757-PPS
The extracts of pods of West African black pepper, Piper guineense, at 5, 10 and 20% (w/v), were applied at two, four and six weekly schedules to control the legume flower bud thrips, Megalurothrips sjostedti on flowers of cowpea, Vigna unguiculata. The trials were conducted for 2 years under rain fed conditions in the northern Guinea savanna region of Nigeria. The results showed that the M. sjostedti population was significantly controlled on treated plots compared with the untreated check in both years. The extracts at the 20 and 10% rates and with six or four weekly applications significantly (P <...
Soil compaction as the possible cause of wilting and premature ripening of sunflower - Short Communication
Karel Veverka, Iva Křížková, Jana Palicová
Plant Protect. Sci., 2006, 42(3):112-117 | DOI: 10.17221/2759-PPS
Brown patches of the size from several square metres to hectares or individual dying plants appeared in otherwise green stands. Affected plants wilt and ripen sooner than healthy ones, causing them to have smaller seeds or none at all in the central part of the heads. Under extreme conditions the plants wilt and die in early summer when they are less than 50 cm high. No infective agent was found as a causal organism. Disturbed plants root only in the upper 10 cm layer of the soil, or just below the surface. Poor soil structure and aeration are supposed to be responsible for limited root development. It prevents a sufficient supply of water to the plants...
Seventieth Birthday of Professor Ing. Václav Kůdela, DrSc. - Biographical Notice
Aleš Lebeda, Karel Veverka
Plant Protect. Sci., 2006, 42(3):118-120 | DOI: 10.17221/2758-PPS