Abhishek Shukla

Feeding potential of predatory mite, Amblyseius alstoniae Gupta (Acari: Phytoseiidae) on Phytophagous mites

An investigation was carried out under laboratory conditions to know the feeding potential of predatory mite, Amblyseius alstoniae feed on three species of phytophagous mites. During entire life period, the male A. alstoniae consumed 22.97±2.56, 13.27±1.09 and 8.44±1.38 eggs, mixed stages and adults of Oligonychus indicus, 36.80±2.05, 13.90±0.96 and 8.30±0.96 eggs, mixed stages and adults of Palyphagotarsonemus latus and 21.27±1.87, 13.53±1.13 and 7.93±1.22 eggs, mixed stages and adults of Tetranychus urticae, respectively. While, the female consumed 29.34±3.05, 19.27±1.62 and 12.93±1.42 eggs, mixed stages and adults of O. indicus, 43.63±2.52, 17.84±1.47 and 10.57±0.88 eggs, mixed stages and adults of P. latus and 27.47±1.82, 17.57±1.25 and 12.60±1.23 eggs, mixed stages and adults of T. urticae, respectively.

Biology of predatory mite, Amblyseius longispinosus (Evens) (Acari: Phytoseiidae) on broad mite, Polyphagotarsonemus latus (Banks)

Biological parameters of A.longispinosus was recorded by feeding on broad mite, P. latusat Acarology Laboratory, Department of Entomology, Navsari Agricultural University, Navsari, Gujarat during April to June of the year 2014 and 2015. The results indicated that the mean of immature period for egg, larvae, protonymph and deutonymph were 2.33±0.49, 3.73±0.70, 4.53±0.52 and 4.67±0.72 days, respectively when feed on P. latus . The total developmental period completes in 15.26±0.68 days, while the pre-oviposition, oviposition and post-oviposition period took 5.53±0.51, 15.73±0.45 and 4.13±0.51 days. The period of adult longevity for male and female were 9.00±0.95 and 25.39±0.45 days, respectively. A single female laid on an average 30.00±2.77 eggs in her life span when reared on T. urticae under the laboratory conditions.

Effect of Alternate Food Sources on Predatory Mite Amblyseius finlandicus (Oudeman) (Acari: Phytoseiidae)

The mites belonging to family Phytoseiidae are considered as generalist predator that plays a major role in keeping the population of phytophagous mites below economic threshold levels. Some Phytoseiid species can develop and reproduce on pollen as well as on tetranychids and eriophyoids (Helle and Sabelis, 1985). Pollen is a fundamental food source for generalist predatory mites (McMurtry, 1992; McMurtry and Croft, 1997) and leaves are excellent pollen traps (Eichhorn and Hoos, 1990; Duso et al., 1997). It has been observed that the populations of predatory mites increase when pollen is abundant on grape leaves (Engel and Ohnesorge, 1994; Duso et al., 1997, 2002, 2004). Plant pathogenic fungi can also be food sources for certain predatory mites (Pozzebon and Duso, 2008; Pozzebon et al., 2009). The presence of grape downy mildew in vineyards increases the persistence of predatory mites (Duso et al., 2003; Pozzebon et al., 2010). Maintenance of laboratory stock culture of predatory mites is a pre-requisite to study their predatory potential against the target mite hosts and to conduct compatibility studies with recommended chemicals. The survival and fecundity of acarophagous International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Volume 6 Number 7 (2017) pp. 1265-1274 Journal homepage: http://www.ijcmas.com

Population Dynamics of Two Spotted Spider Mite, Tetranychus urticae Koch on French Bean ( Phaseolus vulgaris L.)

Studies on population dynamics of T. urticae on French bean cv. GUJARAT RAJMAH revealed that the two spotted red spider mite remained active throughout the crop season in open field condition. The incidence of T. urticae was started from the 1st SMW (first week of January), increased gradually and reached to its peak during 21st SMW (mid of May) (14.27 mite/leaf) in the open field condition. The maximum, minimum, average temperature, evening and average relative humidity had significantly positive correlated with mite population, while morning relative humidity had nonsignificant correlation with T. urticae population.

Screening of brinjal varieties against two spotted spider mite, Tetranychus. urticae (Koch) (Tetranychidae:Acari)

An experiment was carried out to screen sixteen brinjal varieties against two spotted spider mite, T. urticae under field condition. Among all the sixteen brinjal varieties Pant bahar was found moderately susceptible to spider mite attack , while the brinjal variety JBGR-1 was tolerant to spider mite attack underthe field condition. Biomorphological characters of leaf viz., hair density, leaf thickness, length and width also play important role on spider mite incidence on different brinjal varieties. How to view point the article :Mahendrakumar B.N. and Shukla, Abhishek (2016). Screening of brinjal varieties against two spotted spider mite, Tetranychus. urticae (Koch) (Tetranychidae:Acari). Internat. J. Plant Protec., 9(2) : 504-509, DOI : 10.15740/HAS/IJPP/ 9.2/504-509.