تاریخ دریافت: 21 خرداد 1390،
تاریخ بازنگری: 21 مهر 1390،
تاریخ پذیرش: 21 بهمن 1390
چکیده
هرساله آفات گوجهفرنگی از جمله کرم میوهخوار گوجهفرنگی (Hübner) Helicoverpa armiga درصد قابل توجهی از عملکرد گوجه را کاهش میدهند ولی برنامه نمونهبرداری مدونی برای تخمین جمعیت و مدیریت آنها تهیه نشده است. در طول دو سال زراعی 1387 و 1388 مطالعه الگوی توزیع فضایی مراحل نابالغ حشره مذکور در مزارعه گوجهفرنگی با استفاده از شاخصهای پراکنش (Iδ، ID و ) و مدل های Taylor و Iwao بررسی گردید. الگوی توزیع فضایی مراحل نارس با هر دو مدل Taylor و ایوواو به صورت تصادفی بود. بر اساس مقادیر p و R2 به دست آمده از ارتباط رگرسیونی، برای توصیف ارتباط بین میانگین و واریانس جمعیت، مدل تیلور مناسبتر از مدل ایوا او بود که در قسمت میانی بوته بیشترین ضریب تیلور را به خود اختصاص داد. در شاخص موریسیتا، نسبت واریانس به میانگین و k درصد مطابقت جمعیت مراحل نارس با پراکنش تصادفی بیشتر از پراکنش تجمعی بود.
The spatial distribution pattern of immature stages of the tomato fruit-worm Helicoverpaarmigera (Lep.: Noctuidae) in Gorgan district
نویسندگان [English]
Mehdi Shabanipor؛ Ali Afshari؛ Mohsen Yazdanian؛ Saeid Ghadirirad
چکیده [English]
tomato pests, such as tomato fruitworm, Helicoverpaarmigera Hünber (Hym: Eurytomidae), cause high reduction in tomato production, but nosampling program for population estimate and management of them has been developed. Spatial distribution of immature stages of the tomato Fruit-wormwas determined by fitting data to either taylor’s, iwao’s, mean_variance ratio, k and morisita calculating dispersion indices, during 2008 and 2009 growing seasons in tomato fields of Gorgan, Spatial distribution immature (egg and larvae) is a random. Based on R2 and p-values of regression analysis, for most of the natural enemy groups, Taylor’s power law generally provided a more adequate description of variance/mean relationships than Iwao’s patchiness regression model. The median part of plant were fitted most value of Taylor’s b index. Percentage fit of immature stages the dispersion more random ratio bionominal value of morisita, k and mean-variance.
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