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Search Results: 1 - 10 of 105 matches for " Emilija Raspudi "
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THE EUROPEAN CORN BORER (OSTRINIA NUBILALIS HüBNER) REVIEW OF RESULTS FROM CROATIA
Marija Ivezi?,Emilija Raspudi
Poljoprivreda (Osijek) , 2001,
Abstract: European Corn Borer (ECB - (Ostrinia nubilalis Hübner) is one of the most important pest on corn in Croatia. In the last decade corn production was on over 400 000 ha, in Eastern Croatia. Although ECB is present every year, with no such a low intensity, their control is not implemented. Corn is grown in monoculture, at 40% of cornfields, which also has influence on spreading of ECB. In the last ten years average attack of ECB was 51.5%; been done three different kinds of trials for controlling ECB. First trials were carried out in DeKalb hybrids, and ECB was controlled by Biobit XL, on the base of Bacillus thuringiensis Berliner. Intensity of attack was decreased for 46%. Second trial was carried out in ten hybrids, in order to determine the tolerance of hybrids against ECB. It was identified that several domestic hybrids (OSSK 382, OSSK 664 and BC 462) are tolerant to ECB. The third trial was carried out with GM hybrids. Experiments included Pioneer hybrids Evelina Bt, and Landia Bt. Intensity of attack at Evelina standard was 52%, while in Evelina Bt, ECB wasn't present at all. At Landia standard ECB was present on 98%, while in Landia Bt, intensity of attack was 21%. At both Bt hybrids, number of larvae and tunnels was lower comparing to standard hybrids. Length of damage in Landia check was 20.66 cm, while in Landia Bt it was 0.45 cm. The yield was increased for 10.27% at Evelina Bt, and for 26.67% in Landia Bt comparing to their standards. This kind of experiments will be continued in the future, not only because of its agronomic importance, but also because of its ecological relevance.
Distribution of Thysanoptera species and their host plants in Croatia
Emilija Raspudi , Marija Ivezi , Mirjana Brme , Stanislav Trdan
Acta agriculturae Slovenica , 2009, DOI: 10.2478/v10014-009-0016-y
Abstract: Sampling of thrips species and their host plants were carried out from 1993 to 1996 on 111 localities in Croatia. Samples of thrips were taken from 235 different plant species. 33 thrips species from suborder Terebrantia and 14 thrips species from suborder Tubulifera were found in research. The most abundant species were onion thrips (Thrips tabaci) and flower thrips (Frankliniella intonsa), which were found on host plants from 30 and 29 botanical families, respectively. Six new species for Croatia was recorded: Aeolothrips melaleucus, Oxythrips bicolor, Stenothrips graminum, Thrips linarius, Liothrips vaneeckei, and Poecilothrips albopictus.
THE IMPORTANCE OF WESTERN CORN ROOTWORM IN CONTINUOUS MAIZE
Marija Ivezi?,Ivana Maji,Emilija Raspudi,Mirjana Brme?
Poljoprivreda (Osijek) , 2006,
Abstract: Western Corn Rootworm (Diabrotica virgifera virgifera LeConte) is considered to be one of the most important and potentially most severe pest of maize worldwide. The pest was detected in Croatia for the first time in 1995. Since then it has been spread over all areas with maize production in Croatia. The economically most efficient and preventive control measure is crop rotation and growing maize hybrids that show toleranceto WCR. The trials were settled in the area near Dubosevica where in 2002 and 2003 the economic damages caused by WCR were up to 80%. The aim of this investigation is to determine damages on maize root caused by WCR and loss in grain yield on commercial maize hybrids in continuous farming. Pheromone traps, type Csal♀m♂N , were used in order to monitor WCR population dynamics. In the period of two months, 366 WCR adult beetles in total were captured. Root damage was evaluated according to Iowa Node Injury Scale and grain yield was measured and corrected to 14% moisture. Furthermore, the plant lodging, as a consequence of larval feeding, was assessed. The results have shown that root damage for hybrid Bc 5982 was1.15, and 0.73 damage was on Pr 35p 12 roots. The grain yield obtained from hybrid Bc 5982 was 11.7 t/ha, and Pr 35p 12 had 12.3 t/ha. Statistical analyses showed that there were no significant differences in root damage and losses in grain yield between the two investigated hybrids. Results of this investigation indicate that growing maize for 2 to 3 years in continuous farming, in the same field, would not cause economically significant loss in maize gain yield.
EFFECT OF DIFFERENT TRAPS ON CAPTURES OF ADULT CORN ROOTWORM BEETLES (Diabrotica virgifera virgifera LeConte) IN EAST SLAVONIA
Marija Ivezi?,Jon Tollefson,Emilija Raspudi,Dra?en D?oi?
Poljoprivreda (Osijek) , 2002,
Abstract: In 1995 the corn rootworm (Diabrotica virgifera virgifera LeConte) was detected for the first time in east Slavonia, Croatia. Its expansion to the west part has been very fast and from year to year populations of the pest are higher, especially when corn is planted after corn. The aim of this investigation was to find the best trap for monitoring Diabrotica. The studies were conducted by using three types of traps: the USA Trece lure trap, Multigard yellow sticky trap and Hungarian pheromone trap. The treatments were replicated four times in a maize field located in the east of Croatia, very near to the Yugoslavia border. The traps were placed in the field on the 23rd of June and the experiment continued until the 15th of September. Pheromone and Multigard sticky traps were replaced with new ones each month. Traps were positioned 60 m apart within a row and 70 m apart across maize rows. Silking occurred from 30 June to 8 August (exposed silk thoroughly brown and dry). This year was extremely dry, and the first beetles were noticed on the 15th of June. It was 20 days earlier than in 1999. Adult rootworm beetles were removed from the traps once weekly. Pheromone traps captured the most beetles (2263), Multigard sticky traps caught the second most (214) and lure traps the fewest (182) for the whole period. After the replacement of pheromone and Multigard traps, the capture of beetles increased. Of the total number of beetles caught, 85.10% was caught by the pheromone traps, 8.05% by the Multigard sticky traps and 6.85% by the lure traps. Due to this year’s dryness (50% less rainfall than the 20 year average), the investigation should be continued in the future to get more precise results.
THE RESULTS OF INVESTIGATIONS OF WCR (Diabrotica virgifera virgifera Le Conte) ATTACK ON THE AREA OF GUNJA IN 1999
Marija Ivezi?,Emilija Raspudi,Dra?en D?oi?,Mirjana Brme?
Poljoprivreda (Osijek) , 2000,
Abstract: Western Corn Rootworm (WCR) (Diabrotica virgifera virgifera Le Conte) is very important corn pest. The pest was spread in Croatia from 1995 to 1999 on 12,750 km2. In the area of Stara Gunja, hybrid OSSK 444 was sown in order to investigate the possibilities of controls WCR with below ground insecticides - Counter G-5, Dursban G-7,5 and Dotan G-5. With checking root for larvae and cocoons 0.02 larvae was estimated on treated plots and 0.05 larvae on untreated plots. The number of cocoons was 0.12 in treated, and 0.25 on untreated plots. The number of imagoes on silk was 0.05–0.10 per plant. The imagoes of the WCR were caught with Pheromone and Multigard traps from the third decade of June until the first decade of October. On the traps settled on the treated plot (336 m2), 1,376 imagoes were caught, compared to untreated plot (112 m2) where 431 imagoes were caught. The yield of corn was 8.03 t/ha in treatment with Dotan, 8.44 t/ha in treatment with Dursban, and 8.72 t/ha in treatment with Counter, while the lowest 7.98 t/ha was in control plot was. Low number of caught imagoes per plant, shows that, for now, the implementation of chemical preparations wasn’t justified. This kind of investigations should be continuing in the future, and the checking of corn roots must be done earlier in order to determine correct number of larvae on roots and the root damages.
CHEMICAL AND MECHANICAL CONTROL OF COLORADO POTATO BEETLE (Leptinotarsa decemlineata Say) ON POTATO IN AKOVO AREA
Kristijan Rack,Marija Ivezi?,Emilija Raspudi,Mirjana Brme?
Poljoprivreda (Osijek) , 2001,
Abstract: The aim of this investigation was to determine the efficacy in controlling Colorado potato beetles (Leptinotarsa decemlineata Say) by using chemical and mechanical methods of control. The field trials were carried out in 1999 and 2000 in the area of akovo. The aim was also to determine the differences between chemical and mechanical way of control, and on the base of the obtained results, give the recommendations for acceptable and profitable way in controlling Colorado potato beetle. This trial was carried out on the randomized block design, with five treatments in four replications and two locations. The variety Desiree was chosen for the investigations, because it is the most spread sort of potato on examined territory. Mechanical controls consist of collecting of all stages of pests, during the whole vegetation period, on the average every three days. Chemical controls were done by using three different preparations. Imidacloprid (Prestige FC 290) was used as one of the newly active substances for applications on the seed of potato tubers. During the vegetation, thiamethoxam and hexaflumuron were applied. Thy were dosed as it was recommended for each preparation. Average yield of potato in 1999 year showed statistically significant differences between chemical (63,5 t/ha) and mechanical (59,4 t/ha) controlling of Colorado potato beetle, compared to the control plot (54,8 t/ha). In the year 2000 (extremely dry year) this relation was opposite, the yield in chemical control was 38,3 t/ha, and mechanical 38,7 t/ha, while on the control plot it was 29,4 t/ha. These results justified the chemical and mechanical control of Colorado potato beetle. Mechanical control is recommended especially on small farms.
CHEMICAL WEED CONTROL IN OIL PUMPKIN (CUCURBITA PEPO L. VAR. OLEIFERA PIETSCH)
Zdenko Besek,Renata Bali?evi?,Marija Ivezi?,Emilija Raspudi
Poljoprivreda (Osijek) , 2012,
Abstract: A two-year experiment (2002 – 2003) was conducted in oil pumpkin (Cucurbita pepo var. oleifera) at two localities (Vranjevo and Poljanice) to evaluate the effectiveness of chemical weed control through application of herbicides, and to compare it with mechanical weed control. Main weeds were Amaranthus retroflexus, Setaria viridis and Echinochloa crus-galli. All herbicide treatments, except combination of prometrine + fluazifop-p butyl36, in 2002 appeared to be acceptable to high efficacy in control of annual grass- and broad-leaved weeds. The efficacy of all herbicide treatments in 2003 was lower. The best results of herbicide effectiveness were achieved with combination of linuron + dimethenamid (91.3%), trifluralin (90.1%) + napropamide and clomazone + linuron (89%).
INFLUENCE OF EUROPEAN CORN BORER (Ostrinia nubilalis Hübner) ON CORN HYBRIDS IN NORTH-WEST AND EASTERN CROATIA
Zvjezdana Augustinovi?,Emilija Raspudi,Marija Ivezi?,Mirjana Brme?
Poljoprivreda (Osijek) , 2005,
Abstract: European corn borer (Ostrinia nubilalis Hubner) is one of the major corn pest in the world and in Croatia. Former investigations of corn borer in Croatia covered mostly its Eastern region. In trials conducted in 1998 and 1999 the research was extended to the North Western part of Croatia too. Macro trials were carried out with corn hybrids of FAO groups 200-600 at three localities: Kri evci, Agricultural institute Osijek and at Belje PIK Karanac. In 1998 the intensity of the corn borer attack at the locality of Belje PIK Karanac was about 37.92% and in Agricultural institute Osijek 80.83%. In 1999 it varied between 37.08% at the locality of Agricultural Institute Osijek and 71.20% at the locality in Kri evci. The estimated number of holes per plant in all three localities in both years was higher than the number of caterpillars. Length of damage per plant was between 0.38 and 18.80 cm. The data showed significant differences in the intensity of damaging effects on different localities while no significant differences concerning various hybrids were found.The statistical data concerning yield in both years showed significant differences among hybrids, localities and their interactions.
CONTROL OF WESTERN CORN ROOTWORM (Diabrotica virgifera virgifera LeConte) IN CORN PRODUCTION OF EASTERN CROATIA
Dra?en D?oi?,Marija Ivezi?,Emilija Raspudi,Mirjana Brme?
Poljoprivreda (Osijek) , 2003,
Abstract: A new insect pest - the western corn rootworm (Diabrotica virgifera virgifera LeConte) was identified in Croatia in 1995. The first objective of this research was to determine the population density of all stages, except eggs in commercial cor fields. The second objective was to investigate the efficacy of three organophosphate insecticides on larvae. The experiment was conducted in Gunja, Croatia in 1999 and 2000. Treatments were commercial corn hybrids (OSSK 444, OSSK 552, Florencia,) and three soil insecticides (terbuphos, chlorpyriphos-ethyl, chlormephos) applied at planting. Results showed the highest number of larvae per plant (0.70) in the untreated plot of OSSK 552. In 1999, significant differences in larval numbers occurred among hybrids, but not among the insecticides. In 2000, larval numbers only differed statistically between the insecticide treatments. The highest beetles population counted per plant was 0.55 in 2000. This population level is very close to economic threshold of 0.70 beetles per plant. Significant differences in beetle numbers per plant between hybrids were only detected in 2000. Pheromone traps containing the lure, Csal♀m♂N, caught significantly more beetles than the Multigard yellow sticky-trap. Terbufos was the only soil insecticide providing a significant yield advantage to the hybrids. Based on the current value of corn and cost of insecticide, terbufos is the only soil insecticide cost-effective for growers. These studies should be conducted with other insecticides, and growers should avoid planting corn after corn in their fields.
POPULATION DYNAMICS OF NEMATODES IN WINTER WHEAT
Mirjana Brme?,Marija Ivezi?,Emilija Raspudi,Ivana Maji?
Poljoprivreda (Osijek) , 2004,
Abstract: Population dynamics of nematodes in winter wheat were investigated during 2000/2001 years on the area of Knezevo in Baranya county, Croatia. The samples of soil were taken six times during the growing season (from sowing time in autumn, until the end of the vegetation). Total number of nematodes as well as number of genera occurred in samples increased during the vegetation period. Total number of nematodes was the lowest in October, and the highest in April. Similar results occurred in number of genera, the lowest in October, and the highest in March. Population of plant parasitic nematodes was highest in autumn period, and decreased during winter and spring period. Population of bacterivorous nematodes increased over the vegetation period, and were highest in spring. In May, bacterial feeding nematodes reached 65 % of all nematodes and became the most abundant feeding group in the investigation.
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