An experiment was carried out under field conditions at Ziton village in Beni-Sueif Governorate during two successive seasons, 2011-2012 and 2012-2013 to choose the suitable time of insecticide applications and their effect on T. tabaci infestation on garlic plants and resultant yield. The four tested treatments by applying two recommended insecticides at different times of plant growth were Carbosulfan (Marshal 20% EC with recommended rate 200 cm 3 / fed.) and Spinetoram (Radiant 12% SC with recommended rate 120 cm 3 / fed) compared with the untreated garlic plants. Results and their statistical analysis showed clearly that all treatments significantly decreased the population density of T. tabaci and increased the garlic yield comparing with control treatment. The applying of Carbosulfan and Spinetoram at 15 day intervals (12 times of applications) throughout the whole growing season of garlic plant till one month before harvesting (T1) lead to reduce the population density of T. tabaci infesting garlic plants and gave the highest yield in the two studied seasons, as an average head weight of 12463.50 kg / feddan. Although, garlic plants which treated by Carbosulfan and Spinetoram after one month of sowing date from Nov., 1 st at 30 old days till Dec., 15 th (4 times of applications) (T2) infested by higher number of T. tabaci,then gave the considerable head yield (9313.50 kg / feddan). However the application of T3 (Spraying of Carbosulfan and Spinetoram from Jan., 1 st of at 90 old days till Feb., 15 th) and T4 (spraying of Carbosulfan and Spinetoram from March 1 st at 150 old days till April, 15 th) (4 times of applications) were the lowest infested group of T.tabaci and gave the lowest yield in the 4 insecticide applications, as the average of garlic head weight in the two seasons were 8498.70 and 8333.85 kg / feddan respectively. On the other hand, garlic plants in control plots infested by the significantly highest number of T. tabaci and gave the lowest yield when compared with the fourth treatment, as the average head weight in the two seasons was 6139.35 kg / feddan. Concerning the net return of the all tested treatments, T1 gave the best return 13322.55 L.E / feddan.
in two successive seasons; 1998 and1999. The aim of this study was to investigate the effect of planting distances on the growth, yield, essential oil productivity and chemical composition of Rosmarinus officinalis, L. plant. The plants of this experiment were cultivated at a distance of 20, 30, 40, 60 or 80 cm between them in the row and 30 cm between the rows. All the plants of this experiment were fertilized with nitrogen (N) at 150 kg, phosphorus (P 2 O 5) at 50 kg and potassium (K 2 O) at 30 kg/fad. Nitrogen was added in the form of ammonium nitrate (33.5% N), while phosphorus was applied as calcium superphosphate (15.5% P 2 O 5) and potassium as potassium sulfate (48% K 2 O). The obtained results can be summarized as follows: Growing rosemary plants at 20 cm apart resulted in the tallest plants, while, increasing the distance from 20 to 80 cm decreased steadily plant height. Cultivation at 80 cm between the plants in the row increased the number of branches, fresh and dry weights of herb as well as leaves/plant. Also, the plants which grew at this distance had the highest oil percentages and oil yield in their fresh herb and leaves per plant. Whereas increasing planting distances from 20 to 80 cm increased photosynthetic pigments (chlorophylls a, b and total, as well as carotenoids), total carbohydrates, nitrogen, phosphorus and potassium percentages in the herb in the two seasons. As a general trend, it is very clear that the highest values of all previous parameters were resulted in cultivation at the widest distance (80 cm between the plants in the row). Whereas the lowest values of all previous characters were produced from cultivation at the narrow distance (20 cm between the plants in the in the two seasons.
This study was carried out in Beni-Suef district to study the effect of cultivars, some climatic factors and plant age on the population density of Thrips tabaci Lind. on two recommended garlic cultivars, Balady and Chinese throughout two successive seasons 2006-2007 and 2007-2008. The results revealed that the highest infestation rate of T. tabaci was recorded on Balady cultivar, as the corresponding mean number of nymphs and adults were 82.94 and 11.12 individuals / plant in the first season and 62.91 & 11.71 individuals / plant in the second season, respectively. The lowest mean number of T. tabaci was recorded during first period and increased gradually to reach the maximum number during the second period. Positive relationships were recorded between the population density of T. tabaci and the developmental stages of plant. The population density of T. tabaci nymphs and adults were negatively correlated with maximum and minimum temperatures. On the other hand, the mean of R.H was affected positively on the population of T. tabaci in the two investigated years. In the first season, climatic factors were more effective on T. tabaci population nymphs and adults, as the CD (Correlation Coefficient of Determination) were 68.55 and 78.97 % for nymphs and adults on Balady cultivar and vies versa in the second season.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.