Influence of seven white bean genotypes on biological parameters of two spotted-spider mite under laboratory conditions and evaluation of plant damage in greenhouse conditions

Subject Areas : entomology and othea arthropods

S. Mohammadi ¹ , Z. Saeidi ² , A. A. Seraj ³ , A. R. Nemati ⁴ , E. Babaian ⁵

1 - Plant Protection Department, Faculty of Agriculture, Shahid chamran University, Ahwaz, Iran
2 - Plant Protection Department, Agricultural and Nutural Resources Research Center, Chaharmahal and Bakhtiari, Shahrekord, Iran
3 - Plant Protection Department, Faculty of Agriculture, Shahid chamran University, Ahwaz, Iran
4 - Plant Protection Department, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran
5 - Plant Protection Department, Faculty of Agriculture, Shahid chamran University, Ahwaz, Iran

Received: 2010-12-01 Accepted : 2011-10-21 Published : 2012-08-22

Keywords:

Abstract :

Two spotted-spider mite (TSSM), Tetranychus urticae Koch. (Acari: Tetranychidae), is one of the most important pests of bean. Biology of TSSM on white bean genotypes (Dehghan, Sadaf, Daneshkadeh, G-11867, Jules, Goynok98, Kara Casehiro) were studied using leaf disk bioassay   under laboratory conditions (Tempt.: 25±1°C, RH: 50±5%, L:D= 12:12 hours). Moreover, some of the reproductive characteristics of TSSM (egg number, immature and mature numbers) were     evaluated in greenhouse conditions by releasing five adult female mites on two leaf stage plant and estimating mite population after two weeks. The parameters mx, rm  andT of Two spotted-spider mite on seven white bean genotypes were calculated and considered their associations with                 resistance and sensibility of hosts. Results indicated that Dehghan and Sadaf genotypes with lower damage (respectively, 3.40±0.24 and 2.00±0.20 damage score of 6) were resistant genotypes and Daneshkadeh, Goynok98, Kara Casehiro, G-11867 and Jules genotypes with higher damage (respectively, 4.00±0.00, 4.00±0.00, 4.20±0.00, 4.00±0.00 and 5.00±0.00 damage score) showed          levels of sensibility to two spotted-spider mite.