scholarly journals Effects of native plants and IGRs on the development of Tetranychus urticae Koch (Acari: Tetranychidae)

1970 ◽  
Vol 25 ◽  
pp. 19-22 ◽  
Author(s):  
N Naher ◽  
T Islam ◽  
MM Haque ◽  
S Parween
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Developmental Stages ◽  
Nerium Oleander ◽  
Calotropis Procera ◽  
Plant Materials ◽  
Stage Of Development ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch ◽  
Different Doses

Effect of the seed dust of yellow karavi (Nerium oleander L.), flower juice of akanda (Calotropis procera L.) and two IGRs (diflubenzuron and triflumeron) were observed on the development of two-spotted spider mite (TSSM), Tetranychus urticae Koch. The seed dust of yellow karavi and akanda juice delayed the development of T. urticae resulting the elongation of duration of different developmental periods. But, the last stage of development was not affected with these treatments. Similarly, the two IGRs also significantly extended the duration of different developmental stages except deutonymph to adult. The different doses of two plant materials and two IGRs produced different effects on the development of two-spotted spider mite. Key words: Tetranychus urticae, Calotropis procera, Nerium oleander, diflubenzuron, triflumuron, developmental period Univ. j. zool. Rajshahi Univ. Vol.25 2006 p.18-22

scholarly journals Effect of Plant Materials on Developmental Periods of Two Spotted Spider Mite, Tetranychus urticae Koch (Acari: Tetranychidae)

1970 ◽  
Vol 16 ◽  
pp. 121-124 ◽  
Author(s):  
MT Islam ◽  
MM Haque ◽  
N Naher ◽  
S Parween
Keyword(s):  
Tetranychus Urticae ◽  
Adult Development ◽  
Spider Mite ◽  
Developmental Period ◽  
Nerium Oleander ◽  
Plant Materials ◽  
Laboratory Trial ◽  
Two Spotted Spider Mite ◽  
Successive Generations ◽  
Tetranychus Urticae Koch

Low concentration of raw flower juice of Calotropis porcera (Asclepiadecae) and seed dust of Nerium oleander (Apocynacae) significantly delayed the egg to adult development of two-spotted spider mite, Tetranychus urticae Koch, for three successive generations under laboratory trial. The flower juice of C. porcera was found more effective than the seed dust of N. oleander in delaying the developmental period of TSSM. Key words: C. porcera, N. oleander, T. urticae, TSSM, developmental period. DOI:10.3329/jbs.v16i0.3753 J. bio-sci. 16: 121-124, 2008

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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