استفاده از ازن در كنترل سوسك چهارنقطه اي حبوبات .Callosobruchus maculatus F در لوبيا چشم بلبلي و بيد گندم .Sitotroga cerealella O

چكيده انگليسي :

Ozone Application to Control of Cowpea Weevil Callosobruchus maculatus F in Cowpea and Angoumois Grain Moth Sitotroga cerealella O 3 3 2009 Zohre keshmiri@yahoo com College of Agriculture Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language Farsi1 Prof Bijan Hatami supervisor bhatami@cc iut ac ir2 Assoc Prof Mahdi Kadivar supervisor Kadivar@cc iut ac irAbstract ozone application has increased to control stored products pests in recent years due todevelopment of insect resistance into current fumigants trend of consumers to move away fromresidual chemicals and loss of suitable fumigants The attractive aspect of ozone is that it decomposesrapidly half life of 20 50 minutes to molecular oxygen without leaving any residue Electricalgeneration of ozone eliminates the handling storage and disposal problems of conventionally usedpost harvest pesticides These attributes make ozone an attractive candidate for controlling insects instored grain The aim of this study was to investigate the potential use of ozone as a new and safemethod for controlling cowpea weevil Callosobruchus maculatus and angoumois grain moth Sitotroga cerealella For this purpose lethal effect of four concentrations 5780 2737 1767 and 1295ppm of ozone in three times 30 60 and 120 minutes on the all of developmental stages of C maculatus adults and eggs of S cerealella was evaluated Experiments were done three times andusing factorial design in a randomized complete blocks To study the penetration of ozone into grainmass mortality of adults of C maculatus and S cerealella in different depths 30 60 and 90Centimeters of cowpea and wheat mass was calculated in two concentrations 5780 and 2737 ppm ofozone and three times 30 60 and 120 minutes of ozonation Relationship between the number oflived insects concentration of ozone and ozonation time was formulated using Excel software Then by a formula approximate concentration of ozone was calculated in different depths of grain mass Effect of different concentrations of ozone on germination of cowpea and wheat seeds was studied then germination percent in ozonated seeds was compared to control Additionally to investigate theprobable effect of ozone on oxidation of cowpea oil malonaldehyde content of ozonated and controlcowpeas was measured by TBA method and compared Results showed that a concentration of 2737ppm for two hours resulted in 100 mortality of adult egg and young larvae and over 50 mortalityof old larvae and pupa of C maculatus Adults and old larvae showed the lowest and highest sensitivityto ozone respectively Ozone in 5780 and 2737 ppm for two hours caused 100 mortality of adults andover 80 mortality of eggs of S cerealella The effect of ozone on germination of cowpea and wheatseeds showed that 5780 ppm ozone for two hours decreased germination of seeds significantly butthere was no significant differeces between germination of seeds that was ozonated with 2737 ppmozone comparing to control in the same time Measuring mortality in different depths of grain massindicated that a concentration 2737 ppm for two hours resulted in 100 mortality of adult C maculatusin 90 Cm depth though did not have any effect on S cerealella in different depths of wheat Determination of ozone concentration in deferent depths showed that only 55 of initial ozoneconcentration penetrated to 90 Cm depth of cowpea mass after two hours ozonation with 2737 ppmozone whereas at the same time there was no ozone in 90 Cm depth of wheat mass It seems thatozone penetrates in wheat slower than in cowpea mass Results indicated that ozonation in thiscondition is not sufficient to achieve effective ozone concentration in grain mass therefore ozonationtime should be increased Ozonation in the highest concentration in this study for two hours did nothave any effect on oxidation of cowpea oil Conclusively results revealed that ozone can be used as asafe and non chemical method for controlling these stored productes pests Key wo

كشميري، زهره

استفاده از ازن در كنترل سوسك چهارنقطه اي حبوبات .Callosobruchus maculatus F در لوبيا چشم بلبلي و بيد گندم .Sitotroga cerealella O

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