Papers by Mohammad Vali Taghaddosi
Majallah-i ḥifāẓat-i giyāhān, 2018
Codling moth, Cydia pomonella L. is the key pest of apple in Iran. Due to inefficiency of other c... more Codling moth, Cydia pomonella L. is the key pest of apple in Iran. Due to inefficiency of other control measures, insecticide application has been the first option, most common and successful management method so far. In this research, effect of Diflubenzoron (Dimilin® SC48) was compared with Phosalone (Zolone SE 35) and Thiaclopride(kalipso® SC480) in three regions of Zanjan, Urmia and Bojnord using a layout of RCBD with 4 replications for one growing season. Results showed that treatment of Dimilin.with 4.02±0.23, 7.26±1.4, and 2.6±0.42 percent of infection at Urmia, Zanjan and Bojnord recorded the least percent of infection respectively whereas treatment of control with 57.37±4.94, 45.21±3.3 and 57.12±3.08 percent of infection at the same experimental points recorded the highest percent. Treatment of Kalipso with 1.02±0.43 and 3.00±0.44 percent of infection at Urmia and Zanjan and treatment of Zolon at Urmia with 3.65±0.29 registered the same statistical group as the Dimilin. It ...
The food consumption pattern of Colorado potato beetle larvae revealed that the food intake incre... more The food consumption pattern of Colorado potato beetle larvae revealed that the food intake increased exponentially with larval age, with the penultimate and ultimate instars larvae consuming18 and 73% of the total, respectively. Different larval stages of Colorado potato beetle were treated by different doses of Bcillus thuringiensis Berliner var. tenebrionis under laboratory conditions to determine larval susceptibility to this bioinsecticide. The results indicated that in terms of LD50 values younger larvae were more susceptible to the B. thuringiensis than older instars. LD50 values estimated from the collected data indicated a different pattern of susceptibility of larvae to B.t. for different larval stages, as evidenced by non overlapping confidence intervals of relative median potency estimates The LT50 values showed that the speed of larval death depends on the larval age and B. thuringiensis dose. It was concluded that, if the pattern of food consumption and susceptibility ...
Egyptian Academic Journal of Biological Sciences. A, Entomology, 2011
The susceptibility of Leptinotarsa decemlineata (Say) adults to spinosad was determined by leaf d... more The susceptibility of Leptinotarsa decemlineata (Say) adults to spinosad was determined by leaf disk and glass jar techniques under laboratory conditions. The mortalities of the treated adults were recorded 72 h post treatments. LC 50 s values in leaf disk and glass jar methods for adults were 98.50 and 108.34 mg a.i/L, respectively. A significant linear relationship between LC 50 values of individual population across test methods was detected (r = 0.93, P < 0.05). Both bioassay techniques were suitable for monitoring resistance to spinosad in Colorado potato beetle adult populations. Glass jar technique, however, exhibited less variability in LC 50 estimates and showed a higher degree of sensitivity than the leaf disk method. Filter paper and leaf disk techniques for larvae were two bioassay methods used to determine spinosad susceptibility in L. decemlineata population. Both bioassay techniques exhibited a different level of susceptibility of the larvae to spinosad; however, the confidence interval values from filter paper method were narrow than the leaf disk assay technique. A significant direct relationship between LC 50 values of individual population across test methods was observed (r = 0.96, P < 0.05). The glass jar and filter paper testing methods are simple and sensitive test techniques for measuring susceptibility of Colorado potato beetle adults and larvae to spinosad, respectively. The efficacy of spinosad can be conserved for a long period of time if it is judiciously rotated with other suitable insecticides in a spray program and the number of application is restricted.
Egyptian Academic Journal of Biological Sciences. A, Entomology, 2011
The food consumption pattern of Colorado potato beetle larvae revealed that the food intake incre... more The food consumption pattern of Colorado potato beetle larvae revealed that the food intake increased exponentially with larval age, with the penultimate and ultimate instars larvae consuming18 and 73% of the total, respectively. Different larval stages of Colorado potato beetle were treated by different doses of Bcillus thuringiensis Berliner var. tenebrionis under laboratory conditions to determine larval susceptibility to this bioinsecticide. The results indicated that in terms of LD 50 values younger larvae were more susceptible to the B. thuringiensis than older instars. LD 50 values estimated from the collected data indicated a different pattern of susceptibility of larvae to B.t. for different larval stages, as evidenced by non overlapping confidence intervals of relative median potency estimates The LT 50 values showed that the speed of larval death depends on the larval age and B. thuringiensis dose. It was concluded that, if the pattern of food consumption and susceptibility in the present study was used as a model of larval food intake and susceptibility under natural conditions, the larvae must be killed prior to penultimate instar.
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Papers by Mohammad Vali Taghaddosi