3213

3147

كارشناسي ارشد

﴿حشره شناسي﴾

اصفهان :دانشگاه صنعتي اصفهان،دانشكده كشاورزي

1384

سيزده،98،[II]،ص:مصور، جدول ،نمودار،عكس ﴿رنگي﴾

ص.ع به فارسي و انگليسي

بيژن حاتمي

رحيم عبادي،جهانگير خواجه علي،

امير مساح ،ابراهيم سليمان نژاديان

مهندسي كشاورزي

ID3147

به فارسي و انگليسي :قابل رويت در نسخه ديجيتالي

AbstractMole crickets are one of the most destructive groups of turf and pasture pests Thedamage they cause annually is high For best timing of application of chemicalinsecticides it is necessary to determine the time of egg hatching and peak ofpopulation density of first and second nymphal instars Bioecology of mole crickets andseasonal population dynamics in 2004 2005 were studied at two sites in Isfahan whichwere Zayandehrood riverside and Mirzakochakkhan parks Samples were randomlycollected within damaged areas by soil flushing by 4 liters of 0 4 aqueous solution ofdishwashing soap into a 0 25 m2 area of turf Mid line pronotal length of collectednymphs was measured to separate the nymphs into size classes A simple and fast ratingsystem used a 0 25 m2 subdivided quadrat to evaluate damage by mole crickets Damage was rated 0 9 based on the surface activity of mole crickets mounds ortunnels in the quadrat The efficacy of chemicals in the laboratory and the fieldconditions was studied in three experiments The damaging mole cricket species inIsfahan landscape was determined to be a new species Gryllotalpa isfahan Interpretation of nymphal size classes by Dyar s rule suggested that this species hasnine instars The two first nymphal instars appeared by late June and peaked at themiddle of August Sex ratio of male to female was 1 1 7 This insect overwintered asadults and 5th to 9th nymphal instars The results of sampling on 18 July abundance ofsmall nymphs and 18 August abundance of large nymphs at two sites showed a highcorrelation between damage and numbers of nymphs with pronotal length greater than6 7 or 8 mm Slope and intercept of a linear regression of numbers of mole cricketnymphs Y and the surface damage X for the two above mentioned dates overlappedfor nymphs with pronotal length greater than 7 and 6 at Zayandehrood riverside andMirzakochakkhan parks respectively Therefore for the population estimation of molecricket the equations Y 0 31 X 0 38 and Y 0 41 X 0 441 are suggested forZayandehrood riverside and Mirzakochakkhan parks respectively Insecticides usedincluded Chlorpyrifos spray 0 15 Fenpropathrin spray 0 07 16 lit m andCarbaryl 5 bait 200 kg ha in the field indicated that the mortality was high 90 and they were not significantly different from each other In the laboratory Chlorpyrifoscaused significantly higher mortality than other two insecticides P 0 05 The resultsof baits Chlorpyrifos 2 Fenpropathrin 1 5 and Carbaryl 4 used in a controlledfield trial showed that Chlorpyrifos with 84 mortality on surface and subsurface P 0 05 was significantly different and Chlorpyrifos bait was the most effective insecticide against mole cricket G isfahan

بيژن حاتمي

رحيم عبادي،جهانگير خواجه علي،

امير مساح ،ابراهيم سليمان نژاديان