Life Parameters of <I>Tetranychus urticae</I> (Acari: Tetranychidae) on Six Common Bean Cultivars

Abstract

It is well recognized that the quality of host plants affects the development and survival of twospotted spider mite Tetranychus urticae Koch. The life table parameters of T. urticae, on six cultivars of common bean (Phaseolus vulgaris L.) (chiti Khomein, chiti Ks21189, red Akhtar, red Ks31169, white Pak, and white G11867) were studied at constant laboratory conditions (27 +/- 2 degrees C, 70 +/- 5% RH and 16:8 L:D). Total development times of immature males and females were significantly influenced by bean cultivar. T. urticae laid significantly more eggs per day on red Akhtar (16.16) than on the other cultivars. The mean generation time ranged from 23.37 to 34.82 d, and a significant varietal effect was seen. Percentage of egg hatchability oftwospotted spider mite ranged from 88.25 to 94.20%. The highest intrinsic rate of increase, was recorded on red Akhtar (0.269 +/- 0.031) and the lowest value was obtained on white Pak (0.129 +/- 0.048). In addition, net reproductive rate and finite rate of increase of the twospotted spider mite had the highest value on red Akhtar: 62.38 +/- 1.05 and 1.30 +/- 1.02, respectively. The lowest values of these parameters were recorded on white Pak as 26.11 +/- 1.40 and 1.13 +/- 1.10, respectively. Doubling time varied significantly on different cultivars and the lowest and highest values were obtained on red Akhtar and white Pak, respectively. Our findings revealed that white beans (Pak and G11867) were less suitable cultivars, suggesting that they are more resistant to the twospotted spider mite than the other cultivars.

Life table of Tetranychus urticae (Koch) (Acari: Tetranycidae) on different Turkish eggplant cultivars under controlled conditions

“…Because fewer females for each generation are produced by T. urticae females feed on the seven eggplant cultivars, the R o values were found to be much less than the favourable host plants i.e. beans (185.4), soybeans (59-66) and tomatoes (49-131) (Kasap 2002;Dehghan et al 2009;Atalay & Kumral 2013;Najafabadi et al 2014). In addition, both the r m and Ro values of T. urticae were found to be significantly higher in Aydin Siyahi and Kemer, Topan 374 and Yalova Topan cultivars compared with the values of the other cultivars.…”

Preference of red mite Tetranychus ludeni Zacher (Acari: Tetranychidae) to sweet potato genotypes

“…The BD 08, BD 57, BD 17 and the Espanhola were moderately susceptible and the others showed low susceptibility to T. ludeni. The development of the mites may vary between the genotypes of the same species (Modarres Najafabadi et al, 2014) as reported for Amphitetranychus viennensis Zacher and Tetranychus urticae Koch (Acari: Tetranychidae) on apples (Kasap, 2003) and T. urticae on strawberry (Wold and Hutchison, 2003), cucumber (Park and Lee, 2007) and tomato (Keskin and Kumral, 2015). The total height, number of leafs, flowers and fruits and fruit weight were found to be lower on the eggplant (Solanum melongena L. Solanaceae) cultivar Panruti than on the other varieties of this plant (Reddy and Baskaran, 2006).…”

Sugar pea leaf contents and their influence on population fluctuations of Tetranychus urticae under field conditions at Ismailia governorate

“…According to the findings of Sedaratian et al (2008), different cultivars of soybean (Glycine max (L.) Merr., Fabaceae) can influence the bionomics of T. urticae; the authors noted a significant difference in T. urticae population density between seven soybean cultivars studied. Furthermore, Najafabadi et al (2014), found that the development and survive of T. urticae were influenced by quality of the host plant. This finding was observed through an evaluation conducted on six different cultivars of bean (Phaseolus vulgaris L., Fabaceae).…”