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The purpose of applying an additional air flux in field sprayers is limiting liquid drift. The tlux also influences the quality of plant spraying. Air Plus Spridotrain sprayer, produced by RAU company, was applied in the research on the influence of air flux on the quality of coverage of winter wheat (Roma variety). The plant coverage was determined using water sensitive papers.
Influence of grapefruit extract (GE) on mycelial growth, spore germination, population density of Fusarium oxysporum f. sp. cyclaminis and F. oxysporum f. sp. dianthi and its effectiveness in the control of Fusarium wilt of carnation and Fusarium corm rot of gladiolus (F. oxysporum f. sp. gladioli) was studied. Amendment of PDA with 40 μg of GE/cm³ inhibited mycelial growth about 50%. Drenching of...
In the years 1999-2000 the studies on the population of true bugs colonizing the inflorescences of quinoa (Chenopodium quinoa Willd.) were conducted in Chrząstowo near Bydgoszcz. The dominating species was Lygus rugulipennis Popp. The species was recorded in 81.44% in 1999 and 83.64% in 2000 of all collected true bugs.
In the years 1999- 2000 the occurrence of eriophyoids on grasses was studied in the Wielkopolska region. 9 eriophyoid species were recognized on 29 grass species. Eriophyoids were present in 38% examined plant samples. The most often infested were Agropyron repens and Lolium perenne and the least Arrhenatherum elatius. Abacarus hystrix and Aculodes mckenziei were the dominating eriophyoid species...
In 1997-1999 observations of health status of spring barley grown in two-component mixtures with cereals or pea were performed in two experiments, differing in the agricultural utility of soil. A much better health status of the studied species was found in the mixed crop than in their pure stand. Two-component mixtures were differentiated in the occurrence of leaf diseases caused by Drechslera teres,...
In the Institute of Plant Protection Branch in Sośnicowice an investigation was performed on establishing novel methods for testing biological activity or seed dressings against snow mould (Microdochium nivale). Seeds of winter wheat used for the experiments in artificial conditions were disinfected in sodium hypochlorite, subsequently infected with the pathogen, and treated with seed dressing fungicides...
Phenoxy acids significantly increased the number of Sitobion avenae F. and Rhopalosiphum padi L.on wheat treated with Aminopielik D and Illoxan 36 EC. This herbicidal effect could be caused directly by derivatives of phenoxy acid or indirectly by altered metabolism of wheat plant.
Soil, the main element of natural environment is constantly contaminated and degraded by various man’s activities. Big industrial factories, which emil to the atmosphere excessive quantities of harmful solid, liquid and gaseous substances, arc the main cause of this phenomenon. Improper usage of fertilisers and chemical plant protection agents effects the soil in a lesser degree, but it is still unfavourable...
The aim of the field experiments was to evaluate the effect of herbicide Proponit 720 EC used commercially (which content in 1 l - 720 g of propisochlor) for grass- and dicotyledonous weed control in winter wheat, winter barley, sugar beet, pea, potato and maize. The field trials were conducted over period 1995- 1998 in experimental stations, which belong to the Institute of Plant Protection. Proponit...
Occurrence of aphid species was studied in four types of midfield thickets in the Lower Vistula Landscape Park in Poland. This paper presents and discusses the relationships between aphid communities, their species diversity and dominance structure in these thickets.
In greenhouse experiments the susceptibility of meadow fescue, perennial ryegrass and ltalian ryegrass to Fusarium avenaceum, F. culmorum and F. graminum infection was studied. Various responses to Fusarium spp. infection were observed among the tested grass species and their cultivars. Meadow fescue was the most susceptible to all the Fusarium isolates used. F. avenaceum isolates also strongly reduced...
The process of plant selection by insects is mediated by repellents and attractants. Several compounds may be involved in this interaction. Thus intraspecific variation of the compounds concentration play an important role in the herbivory. The best tool for the characteristic of this variation is chemometrics. The strategy of the analysis with the use of literature data on terpenes and sesquiterpenes...
The influence of powdered fruits of Foeniculum capillaceum Gilib. on the fecundity of Sitophilus oryzae was examined. The powder was added in paper bags to the rearing of the insects to prevent a direct contact. The significant reduction of the fecundity of females was recorded. The sequent effect of activity of the powder was also observed. It resulted in the decrease of the fecundity of offspring...
In the years 1977- 1979 and 2000 the bugs (Heteroptera) were collected from yarrow, well-known herbaceous plant. lt turned out that the bugs made up to 30% on average of all arthropods collected from yarrow. The most numerous were phytophagous bugs (79-96%), among them the known pest of genera Lygus and Plagiognathus. Among zoophagous bugs the most numerous were genera Nabis and Orius. Both of phytophagous...
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