Showing 14 results for Mobli
M. Mehrparvar, M. Mobli, B. Hatami,
Volume 12, Issue 45 (fall 2008)
Abstract
Rose is one of the most important ornamental shrubs of the world because of its durability, long period of flowering, different cultivars and its beauty. The rose aphid, Macrosiphum rosae is the most important pest of the rose which causes significant economic damage annually. In order to compare four rose cultivars including Black Magic, Caramba, Noa and Good Life, and a wild rose, Nastaran, infested with rose aphid, a split-plot in time experiment was arranged in randomized complete block design layout with three replications, in Isfahan (Iran) from February 2004 to March 2005. The infestation levels of roses with the rose aphid and its seasonal fluctuations were determined by weekly sampling. Analysis of data showed that there are significant differences (P<0.01) between cultivars. Noa (with pink flowers) has the highest infestation of rose aphid (with average 23.12 ± 0.036 aphids) and Caramba (with yellow flowers) has the lowest infestation (with average 6.46 ± 0.036 aphids). The wild rose, Nastaran, showed low infestation (with average 8.76 ± 0.036) as well. Different sampling times also showed significant differences (P<0.01). There was a significant interaction (P<0.01) between cultivars and sampling date, such that reactions of cultivars to aphid (nymphs, adults and total) were not similar in different sampling dates. Seasonal fluctuations of the rose aphid showed two peaks in a year, in May and December. Activity of the rose aphid in spring which coincides with rapid growth and tenderness of rose foliage causes severe fading and inhibiting of floral opening.
S. M. Mansouri, R. Ebadi, M. Mobli,
Volume 12, Issue 45 (fall 2008)
Abstract
Onion thrips (Thrips tabaci Lind.) is one of the important factors which indirectly restrict the proper yield of onion (Allium cepa L.). Therefore, finding tolerant cultivars to onion thrips is important. Because of many small florets, cross pollination in onion which is a biennial plant by using polycross method for breeding is suitable and easy. To produce polycross seed, bulbs of 9 self pollinated onion genotypes were planted in the shape of equilibrium lattice design for 9 treatments in May 2002. To study tolerance to onion thrips and assess other agronomical characteristics, the polycross seeds produced from free pollination and self pollinated plant seeds (totally 18 genotypes) were planted in a randomized block design with four replications. The main plots were sprayed and not sprayed, and sub-plots were onion genotypes. From August to October 2003, samples were taken from each plot bi-weekly, and number of thrips, and percentage of injury on plants were recorded. As a result of this study, Azarshahr self pollinated genotype showed maximum population density of thrips (22.24) and injury, but Ghom and Abarkooh genotypes showed the lowest amount (2.65 and 5.68 respectively) among all genotypes. Among pollycross genotypes, Ghom and Kashan genotypes showed low population densities (4.3 and 4.24 respectively) and injury, but Azarshahr and Tarom showed high population densities (20.66 and 19.84 respectively) and percentage of injury. Generally, polycross reduced population density of thrips and percentage of injury.
J. Khajehali, M. Kohansal, B. Hatami, M. Mobli,
Volume 22, Issue 2 (Summer 2018)
Abstract
The grape leafhopper, Arboridia kermanshah Dlabola (Hemiptera, Cicadellidae), is an economically important pest of most vineyards in Isfahan. The effects of two irrigation regimes [normal (100 liter/ tree/ week) and minimum (100 liter/ tree/two weeks)] seasonal population changes and the damage of A. Kermanshah as well as the percentage of leafhopper egg parasitism by Anagrus atomus were studied on five grape cultivars including Shahani, White Rishbaba, Askari, Black Rishbaba and White Yaghoti; this was done in a completely randomized blockdesign with split plots in three replications at Isfahan University of Technology in the 2005-2006 period. Adults and nymphs were assessed by weekly sampling using a vacuum insect collector (D-VAC). Non-parasitized and parasitized eggs were counted weekly by clipping three leaves from different strata of vine canopy as a sample unit, in each plot. The results showed that the leafhopper population density, damage percentage and egg parasitism in both years of study in the normal irrigation plots were higher than those with the minimum irrigation. The maximum density of adults and nymphs was observed in June and early July on the White Yaghoti. The highest egg density and parasitism were recorded in June and October-November, respectively, on black Rish-baba in the normal irrigation. The highest damage was on the white Yaghoti in August and September, and the lowest damage was on Askari and Shahani, both in the normal irrigation regime.
