Plant Protection Science, 2001 (vol. 37), issue 4

Flight patterns of Hedya dimidioalba, Spilonota ocellana and Pandemis heparana (Lep.: Tortricidae) based on data from pheromone trapsOriginal Paper

Jitka Stará, František Kocourek

Plant Protect. Sci., 2001, 37(4):129-137 | DOI: 10.17221/8376-PPS  

During 1992-1999 the flight activity of Hedya dimidioalba, Spilonota ocellana and Pandemis heparana was investigated by pheromone traps placed in six apple orchards and a plum orchard in Central and East Bohemia. The cumulative catches of each species were plotted against time of the catch expressed as the sum of degree-days above 10°C (H. dimidioalba and S. ocellana) and 8°C (P. heparana) and approximated by Richards' function. Common parameters of Richards' function could be found for Hedya dimidioalba and Spilonota ocellana from all localities. In Pandemis heparana...

Occurrence, pathogenicity and survival of Macrophoma mangiferae in leaves, branches and stems of mango (Mangifera indica L.)Original Paper

Ralph N. Okigbo

Plant Protect. Sci., 2001, 37(4):138-144 | DOI: 10.17221/8377-PPS  

Frequency of occurrence and persistence of Macrophoma mangiferae Higorani & Sharma on 4-year old mango plants (Mangifera indica L.) growing under various conditions were investigated over two periods of 6 months in South-Eastern Nigeria. Among the five locations studied, the frequency of occurrence of the disease was highest at Umuahia, with 65% for leaves and 41% for stems. The chances of the fungus to survive adverse conditions in mango tissues were higher in the stems and branches than in the leaves; more fungal colonies were recovered from the stems and branches than from the leaves. The fungus survived adverse conditions,...

Response of susceptible, partially resistant and resistant winter wheat cultivars to Blumeria graminis f.sp. tritici - short communicationShort Communication

Lubomír Věchet

Plant Protect. Sci., 2001, 37(4):145-148 | DOI: 10.17221/8378-PPS  

Response of the susceptible cultivar Kanzler, the partially resistant cultivar Mikon and the resistant cultivar Asta (genes of resistance Pm2, Pm6) to powdery, were tested in two years small plot-experiments. Disease severity was influenced by weather conditions. There were highly significant differences in disease severity, infection type and number of diseased plants between the susceptible cultivar and the cultivars with partial resistance and specific resistance. Smaller differences were between the partially resistant cultivar and the resistant cultivar than between the cultivar with partial resistance and the susceptible cultivar....

An unusual Penicillium on rockwool in glasshousesShort Communication

I. Šafránková, L. Marvanová

Plant Protect. Sci., 2001, 37(4):149-150 | DOI: 10.17221/8379-PPS  

Species of the genus Penicillium are ubiquitous saprotrophs, spreading easily by conidia through the atmosphere. They appear most frequently in soil and on various organic matter. Penicillium olsonii had been found on seeds of various plants in the Philippines, Thailand and Indonesia. In our case, this fungus was found on the strips of rockwool in the glasshouses of Horticultural Faculty in Lednice (Mendel University of Agriculture and Forestry in Brno) in 2000 and 2001. The strain is preserved in the Czech Collection of Microorganisms, Brno, Czech Republic, as CCM 8259.

A new concept of economic injury level that includes penalization of damage to quality and safety of agricultural productsDiscussion

Václav Stejskal

Plant Protect. Sci., 2001, 37(4):151-156 | DOI: 10.17221/8380-PPS  

The traditional model of Economic Injury Level (EIL) does not allow to directly incorporate aspects of damage to quality and safety of a product (Dq) into the decision-making process to control a pest (pathogen, weed, arthropod, vertebrate). This work now attempts to generalize a concept of EIL by (i) separating damages to quality and safety (i.e. Dq and EILq) from quantitative (i.e. Dw and EILw) types of damage (D) in the traditional EIL-equation, and (ii) by establishing a new way of estimation of EILq based on the penalization of quality and/or safety damage. The importance...