Plant Protection Science, 2007 (vol. 43), issue 2
History of bacterial ring rot of potato in the Czech Lands and a proposal for relaxation of strict quarantine measures
Václav Kůdela
Plant Protect. Sci., 2007, 43(2):35-46 | DOI: 10.17221/2254-PPS 
In the supposed or proven incidence of bacterial ring rot caused by Clavibacter michiganensis subsp. sepedonicus (Cms) in certified seed and commercial potatoes, five periods can be identified in the Czech Lands from 1910 to 2006: (i) high incidence of Cms in potato crops is claimed (about 1910-1929); (ii) very low incidence in certified potatoes and sporadic occurrence in commercial potatoes (about 1930-1985); (iii) increasing incidence of Cms in certified seed potatoes and its sporadic occurrence in commercial potatoes is assumed (about 1986-1997); (iv) a relatively...
The horse chestnut leafminer Cameraria ohridella: chemical control and notes on parasitisation
Jelena Kuldová, Ivan Hrdý, Petr Janšta
Plant Protect. Sci., 2007, 43(2):47-56 | DOI: 10.17221/2255-PPS
The expected high efficacy of Dimilin but also good protection by treatment with Confidor and Calypso were demonstrated. Mospilan was less effective. A high mortality of ultimate larval instars of the leafminer and their substantial parasitisation was observed in experiments with potted seedlings on Confidor and Calypso treated leaves of horse chestnut, Aesculus hippocastanum. The parasitoids found in mines with larvae and pupae of C. ohridella on A. × carnea and A. hippocastanum were recorded and determined. The most abundant species was Minotetrastichus frontalis (Chalcidoidea, Eulophidae). The...
Influence of application term on effectiveness of some insecticides against brassica pod midge (Dasineura brassicae Winn.)
Roman Pavela, Jan Kazda, Gerhard Herda
Plant Protect. Sci., 2007, 43(2):57-62 | DOI: 10.17221/2258-PPS
In 2005 we determined the effectiveness of two preparations against gall pod midge in dependence on different terms of application, i.e. at full flowering (BBCH 65) and after flowering (BBCH 67) of winter oilseed rape. The tests were carried out at three localities in the Czech Republic, and the two preparations used were Calypso 480 SC (a.i. thiacloprid) and Karate Zeon 5CS (a.i. lambda-cyhalothrin). It was found that applying the preparations at BBCH 67 was significantly more effective than treatment at BBCH 65.
The effect of cryopreservation on germination of dandelion seeds
Zdenka Martinková, Alois Honěk
Plant Protect. Sci., 2007, 43(2):63-67 | DOI: 10.17221/2257-PPS
Germination experiments frequently use seeds that had been stored frozen. We investigated whether short, 5 day freezing changes percentage and rate of germination of seeds of dandelion (Taraxacum officinale agg.). Seeds (i) collected at dispersal, (ii) dried at +50°C for 5 days, (iii) frozen at -20°C for 5 days, (iv) dried for 5 days and subsequently frozen for 5 days, and (v) frozen and subsequently dried, were then germinated at +10°C and a long-day photoperiod. None of the temperature pre-treatments affected the proportion of germinating seeds. By contrast, the time to germinate 50% of the seed...
Evaluation of the efficacy of protectants against cowpea bruchids (Callosobruchus maculatus (F.)) on cowpea seeds (Vigna unguiculata (L.) Walp.)
George B. Swella, Deus M. K. Mushobozy
Plant Protect. Sci., 2007, 43(2):68-72 | DOI: 10.17221/2256-PPS
A laboratory experiment of a completely randomised design and replicated four times evaluated the effectiveness to control the bruchid, Callosobruchus maculatus in cowpea by the synthetic insecticide Actellic dust, and by the natural protectants ash, coconut oil, powdered cloves and black pepper. The data collected included the number of damaged and undamaged seeds, weight of damaged and undamaged seeds and the number of live and dead bruchids. Seeds treated with Actellic dust and black pepper powder had significantly low percentages of damaged seeds. Black pepper powder and coconut oil showed good potential in protecting cowpea against bruchid...
First report of potato stolbur phytoplasma in hemipterans in southern Moravia - Short Communication
Milena Březíková, Šárka Linhartová
Plant Protect. Sci., 2007, 43(2):73-76 | DOI: 10.17221/2253-PPS
In 2005, the first screening tests to confirm the presence of potato stolbur phytoplasma in hemipterans by the PCR method were carried out to determine the spectrum of possible vector species for further analyses. Potato stolbur phytoplasma was confirmed in two out of five tested individuals of Hyalesthes obsoletus and in one mixed sample (10 individuals) from 17 tested samples of Lygus spp. As far as we know this is the first occurrence of potato stolbur phytoplasma in Hyalesthes obsoletus and Lygus spp. confirmed by the PCR method in the Czech Republic.