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.
www.eajbs.eg.net Comparison between the infestation rate of certain pests on cucumber and kidney bean and its relation with abiotic factors and anatomical characters.
The study aimed to investigate IPM techniques which would reduce potato tuber moth (PTM), Phthorimaea operculella ( Zeller ) (Lepidoptera : Gelechiidae ) , population in potato fields . Three IPM techniques , potato planting date, sex pheromone-baited water traps and the bioinsecticides were tested. Results indicated that early planting of potato summer plantation in January, significantly reduce the population of Ph . operculella larvae from four tested planting times . Sex pheromone -baited water traps. were effective as a means of detecting and monitoring the occurrence of adults of Ph . operculella in both seasons of 2004 and 2005 . Moreover potato plants in fields containing traps were statistically less infested with Ph. operculella than plants in field without traps by % reduction amounted 21.7 % in winter plantation and 27.1 % in summer plantation . The correlation between catches of potato tuber moth males and each of max and min temperature in winter plantation were significant .Spraying of potato plants with bioinsecticides significantly reduced number of PTM larvae . Spinosad ( Tracer 24% SC ) was the most effective insecticide followed by botanical insecticides Azadirachtin (Achock 15% EC ) and Soybean oil ( Naturals 96% EC ). Thus early planting of potato summer plantation in January , Sex pheromone -baited water traps and bioinsecticides may be a promising components of IPM strategies for reducing Ph. operculella population in potato fields .
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