The spatial distribution pattern of immature stages of the tomato fruit-worm Helicoverpaarmigera (Lep.: Noctuidae) in Gorgan district

Subject Areas : Plant Protection

Mehdi Shabanipor ¹ , Ali Afshari ² , Mohsen Yazdanian ³ , Saeid Ghadirirad ⁴

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Received: 2011-06-11 Accepted : 2012-02-10 Published : 2012-03-20

Keywords:

Abstract :

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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