Host Plant-Induced Susceptibility of Two-Spotted Spider Mite Tetranychus urticae (Acari: Tetranychidae) to Some Reduced-Risk Acaricides

Abstract

The two-spotted spider mite Tetranychus urticae (Acari: Tetranychidae) is a cosmopolitan pest of a large number of host plants having extensive damage potential and the terrific ability of pesticide resistance. In the present study, spider mite population were reared continuously on the leaves of three susceptible host plants namely country bean (Phaseolus vulgaris L), papaya (Carica papaya L) and jute (Corchorus olitorius L) and their susceptibility to some reduced-risk acaricides were determined by leaf disc bioassay method. Abamectin was found to be the most toxic acaricide (LC 50 values were 0.432, 0.342 and 0.324 mg L −1 on the country bean, papaya and jute leaf discs respectively at 24 h after treatment application) which was followed by azadirachtin, emamectin benzoate, spinosad and hexythiazox respectively. For all the tested acaricides, toxicity increased proportionately with increasing time duration after treatment application. Moreover, spider mites reared on country bean leaves were comparatively less susceptible to all acaricides followed by mites reared on papaya and jute leaves respectively. Based on the present study, it might be inferred that host plants play a considerable role in the susceptibility of spider mites to acaricides and abamectin could be used as a puissant chemical for controlling spider mites.

Field and Laboratory Study to Compare the Effect of some Compounds on Tetranychus urticae (Koch) and Tetranychus cucurbitacearum (Sayed) on Soybean Plants

“…Tarikul Islam (2018). Mentioned that, "abamectin" was the most-toxic as acaricide "Lc50 values" counted (0.432, 0.342 and 0.324mgl -1 ) on country bean papaya and jute leafdiscs for T. urticae, respectively, at 24hr.…”

Efficiency of some Jasmonic Acid Concentrations on Mortality of Two-Spotted Spider Mite Tetranychus urticae Koch on Eggplant

“…The results in Table (2) showed the significant differences in jasmonic acid concentrations, eggplant varieties, time periods and interactions between them.…”

“…The two-spotted spider mite Tetranychus urticae Koch belongs to Class: Arachnidae, Sub class: Acari, Order: Acariforms, Sub order: Actinedida (Prostigmata), Family: Tetranychidae and Sub family:Tetranychinae [1]. The red mite family Tetranychidae especially the two-spotted spider mite species Tetranychus urticae is a multi-hosts (polyphagus) widespread in the world and it has ability to infest more than 1100 species of plants belonging to more than 140 plant families, including more than 300 species of economic importance plants such as vegetables and fruits [2,3]. 1225 (2023) 012065 IOP Publishing doi: 10.1088/1755-1315/1225/1/012065 2 [4] pointed out that the T. urticae species of mite affects the crops of Solanaceae family and causes significant losses within the greenhouses in India, and [5] was indicated that the two-spotted spider mite infected eggplant crop in most Asian and African countries.…”