scholarly journals Lethal and sublethal effects of bifenazate on the biological parameters of Tetranychus truncatus Ehara (Acari: Tetranychidae)

2021 ◽  
Author(s):  
Sabrina Jahan Rimy ◽  
Gopal Das ◽  
Tetsuo Gotoh ◽  
Mohammad Shaef Ullah
Keyword(s):  
Life Table ◽  
Sublethal Effects ◽  
Agricultural Crops ◽  
Lablab Purpureus ◽  
Asian Countries ◽  
Negative Effects ◽  
Life Table Parameters ◽  
Greenhouse Crops ◽  
Adult Females ◽  
Lc50 And Lc90

Tetranychus truncatus Ehara (Acari: Tetranychidae) is one of the serious pests that infests different agricultural crops in field and greenhouse crops, and its distribution is limited to mostly Asian countries. The experiments were conducted to know the effectiveness of different concentrations of bifenazate against the T. truncatus, and to evaluate and compare the demographic parameters of T. truncatus on host plant Lablab purpureus (L.) Sweet (Fabaceae), which were obtained from females treated with bifenazate. The LC15, LC30, LC50 and LC90 values are determined through the bioassay from the results of the first application of bifenazate on adult females of T. truncatus. The LC15, LC30, LC50 and LC90 concentrations of bifenazate were 0.417, 1.028, 2.591 and 24.792 ml/l, respectively. The response of adult females against the two lethal concentrations (LC15 and LC30) was mostly alike but had a little bit difference. The differences in life table parameters were observed between control and treated spider mites. The results demonstrated that LC15 and LC30 of bifenazate could reduce the survival rate, oviposition period, fecundity and longevity of females of T. truncatus and it significantly affected the developmental times, especially larval duration and fecundity of T. truncatus. Life-table parameters of T. truncatus were much reduced in LC15 and LC30 compared to the control and their growth and other factors showed significant differences. The present study showed that the lower lethal concentration (LC15 and LC30) of the tested acaricide showed negative effects on survivorship and life-table parameters of the subsequent generation of T. truncatus.

Sublethal Effects of Cyantraniliprole and Imidacloprid on Feeding Behavior and Life Table Parameters ofMyzus persicae(Hemiptera: Aphididae)

2016 ◽  
Vol 109 (4) ◽  
pp. 1595-1602 ◽  
Author(s):  
Xianyi Zeng ◽  
Yingqin He ◽  
Jiaxing Wu ◽  
Yuanman Tang ◽  
Jitao Gu ◽  
...  
Keyword(s):  
Feeding Behavior ◽  
Life Table ◽  
Sublethal Effects ◽  
Life Table Parameters

scholarly journals Thiacloprid + Deltamethrin on the Life-Table Parameters of the Cotton Aphid, Aphis gossypii (Hemiptera: Aphididae), and the Parasitoid, Aphidius flaviventris (Hymenoptera: Aphelinidae)

2020 ◽  
Vol 113 (6) ◽  
pp. 2723-2731
Author(s):  
Marzieh Majidpour ◽  
Nariman Maroofpour ◽  
Mojtaba Ghane-Jahromi ◽  
Raul Narciso C Guedes
Keyword(s):  
Pest Management ◽  
Life Table ◽  
Sublethal Effects ◽  
Aphis Gossypii ◽  
Parasitoid Wasp ◽  
Cotton Aphid ◽  
Life Table Parameters ◽  
Parasitism Rate ◽  
Sublethal Exposure ◽  
Negative Impacts

Abstract A combination of pesticides and biological control agents is frequently necessary to achieve successful pest management requiring the assessment of their compatibility for the intended purpose. Aphidius flaviventris Kurdjumov is one of the parasitoids of the cotton aphid Aphis gossypii Glover, whose susceptibility to pesticides was not yet investigated. Accordingly, we investigated the lethal and sublethal effects of the commonly utilized insecticide mixture thiacloprid + deltamethrin on the cotton aphid and its parasitoid wasp Aphidius flaviventris. The estimated LC50 for the aphid was 14.1 mg ai/l; the effects of sublethal exposure at LC10 (2.80 mg ai/l) and LC30 (7.28 mg ai/l) on the aphid life-table parameters led to significantly increase on the development time of third- and fourth-instar nymphs and preadult. Sublethal exposure to the insecticide mixture compromised aphid longevity, fecundity, and life-table parameters (r, R0, and T). Moreover, population growth and parasitism rate of the parasitoid were significantly compromised at both concentrations of the insecticide mixture under sublethal exposure. These results not only indicate the efficacy of thiacloprid + deltamethrin against the cotton aphid, but also raise concerns regarding its negative impacts on the parasitoid Aphidius flaviventris and caution against its use in pest management programs.

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