scholarly journals Suppression of the Two-Spotted Spider Mite on Peanuts1

1974 ◽  
Vol 1 (1) ◽  
pp. 30-34
Author(s):  
W. V. Campbell ◽  
R. W. Batts ◽  
R. L. Robertson ◽  
D. A. Emery
Keyword(s):  
North Carolina ◽  
Laboratory Tests ◽  
Spider Mite ◽  
Field Tests ◽  
Good Control ◽  
Laboratory Studies ◽  
Major Pest ◽  
Potential Losses ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch

Abstract The two-spotted spider mite, Tetranychus urticae Koch, is a major pest of peanuts in North Carolina. Mite populations increase during hot, dry weather and are especially destructive in August and September. The potential losses to peanuts due to mites prompted an investigation of the miticidal and ovicidal properties of fungicides and insecticides currently registered for peanuts as well as the evaluation of chemicals not registered on peanuts for control of the two-spotted spider mite. Plictran, Galecron, Trithion, Azodrin, Carzol, and Omite provided good suppression of the spider mite in field tests. Laboratory studies, using a five second dip technique, indicated Plictran, Galecron, and Trithion had good ovicidal properties. The fungicides Du-Ter and Benlate exhibited a low level of ovicidal action. Du-Ter recommended for leaf spot control gave good control of mites in the laboratory tests and suppressed mite buildup in greenhouse experiments.

scholarly journals Effects of local isolates of Beauveria bassiana (Balsamo) Vuillemin on the two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae)

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Cenk Yucel
Keyword(s):  
Tetranychus Urticae ◽  
Beauveria Bassiana ◽  
Spider Mite ◽  
Lethal Effect ◽  
Probit Analysis ◽  
Plant Feeding ◽  
Wide Range ◽  
Two Spotted Spider Mite ◽  
Short Time ◽  
Tetranychus Urticae Koch

Abstract Background The two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae), is a widely distributed plant-feeding pest that causes significant yield losses in a wide range of crops. Newly developed or improved environmentally friendly biocontrol agents serve as an alternative to traditional pest control tools. Experiment of the effects of 2 local fungal isolates of Beauveria bassiana (BGF14 and BCA32) was carried out against T. urticae under laboratory conditions. Results Both tested isolates had lethal effect in a short time after application, and this effect increased as time progressed. BGF14 and BCA32 isolates caused T. urticae mortality rates ranging from 25.88 to 61.92 and 32.36 to 62.03% when applied at the concentrations between 1×105 and 1×108 conidia/ml, respectively. According to the Probit analysis performed on the effect of fungi on T. urticae adults, the LC50 values of BGF14 and BCA32 isolates on the 7th day after inoculation were 2.6×106 and 6.3×104 conidia/ml, respectively, and the LT50 values for both fungi applied at a concentration of 108 conidia/ml were 2.14 and 2.23 days, respectively. Conclusions The 2 isolates of B. bassiana (BGF14 and BCA32) had the potentials to suppress T. urticae population and can be recommended as promising biocontrol agent candidates for control of T. urticae.

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