The abundance of Orius niger (Wolf.) and O. minutus (L.) in potato fields and their life table parameters when fed on two prey species

Biocontrol Science and Technology

2014

Self Cite

To cite this article: Seyed Ali Asghar Fathi (2014) Efficiency of Orius minutus for control of Tetranychus urticae on selected potato cultivars, Biocontrol Science and Technology, 24:8, 936-949,The influence of host plant traits of five potato cultivars: Savalan, Agria, Morene, Kondor and Diamant on the population density of two-spotted spider mite (TSM) Tetranychus urticae Koch, and ovipositional preference, predation rate and life history parameters of its predator Orius minutus L. were studied under laboratory conditions (23 ± 1°C, 50 ± 5% RH and 14L:10D). The density of TSM adults on Savalan, Agria and Morene was significantly lower than on Kondor and Diamant. In both no-choice and free-choice experiments, the females of the predator laid more eggs on TSM-infested leaves of Savalan (6 eggs/leaf and 24 eggs/plant) than on Agria, Morene, Kondor and Diamant. In predation rate experiments, the females of O. minutus consumed more TSM on the infested leaves of Savalan (32 TSM/predator during 48 hours) than on Agria, Morene, Kondor and Diamant. In performance experiments, the predator nymphs developed faster when reared on TSM-infested leaves of Savalan (16 days) than on Kondor and Diamant. Moreover, the survival rate, from egg to adult, of O. minutus on TSM-infested leaves of Savalan (52.8%) was better than on Kondor and Diamant. The fecundity of O. minutus reared on TSM-infested leaves of Savalan (11.7 eggs/female) was significantly higher than on Agria, Morene, Kondor and Diamant. The intrinsic rate of natural increase and the population growth rate of O. minutus were highest when reared on TSM-infested leaves of Savalan (r m = 0.089 day −1 and λ = 1.094 day −1 ). These results suggest that using Savalan cultivar integrated with O. minutus could result in improved efficacy of this predator and lead to effective and more sustainable management of T. urticae in potato fields.

Section: Introductionmentioning

confidence: 99%

“…In this region, the potato crop is sprayed intensively with pesticides for control of various pests including: the Colorado potato beetle, Leptinotarsa decemlineata (Say); green peach aphid, Myzus persicae (Sulzer); onion thrips, Thrips tabaci Lindeman; and two-spotted spider mite (TSM), Tetranychus urticae Koch (Fathi, 2009).…”

Section: Introductionmentioning

confidence: 99%

Efficiency ofOrius minutusfor control ofTetranychus urticaeon selected potato cultivars

Biocontrol Science and Technology

2014

Self Cite

“…However, this moth quickly develops resistance to insecticides due to its higher fecundity and shorter generation time (Talekar and Shelton 1993;Luogen et al 2005;. Failure of insecticides to successfully control P. xylostella and their potential adverse impacts on the environment have prompted the use of alternative approaches such as host plant resistance and biocontrol agents (Smith 1989;Fathi 2009). …”

Section: Introductionmentioning

confidence: 99%

Preference and performance of Plutella xylostella (L.) (Lepidoptera: Plutellidae) on canola cultivars

Bozorg-Amirkalaee

Sarfaraz³

2010

J Pest Sci

Self Cite

The diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae), is an important insect pest of canola, Brassica napus L., in Ardabil, Iran. Host plant resistance is an essential component of integrated management of P. xylostella. We investigated the preferences and performance of P. xylostella on nine commercial cultivars of canola, namely Zarfam, RGS003, Adder, Okapi, Opera, Hyola401, Ebonite Option500 and Elite under greenhouse conditions at 23 ± 1°C, 50 ± 5% RH and 14L:10D. In free-choice situation, oviposition was lowest on Opera (23.5) and highest on Zarfam (44.7). In the life table study, fecundity of new generation female moths was lowest on Opera (95.4) and highest on Adder (145.7). Survival from egg to adult was significantly lower on Opera, Option500 and Hyola401 than on other tested cultivars. The intrinsic rate of natural increase (r m ) and population growth rate (k) were lowest on Opera and highest on Zarfam.

“…High population densities of Orius niger Wolff and O. minutus L. relative to all anthocorid species present during field observations conducted for two years in unsprayed potato fields in the Ardabil region of Iran suggested their potential utilty in a biological control program against the onion thrips, Thrips tabaci Lind., and the twospotted spider mite, Tetranychus urticae Koch, (Fathi 2009). Few studies have been conducted to evaluate the role of these two predator species in regulating onion thrips and the two-spotted spider mite populations infesting potato fields.…”

Section: Introductionmentioning

confidence: 99%

Assessing the potential for biological control of potato field pests in Ardabil, Iran: functional responses of Orius niger (Wolf.) and O. minutus (L.) (Hemiptera: Anthocoridae)

Nouri-Ganbalani

2009

J Pest Sci

Self Cite

The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), and the onion thrips, Thrips tabaci Lind. (Thysanoptera: Thripidae), are significant field pests of potato in the Ardabil region of Iran. Orius niger (Wolf.) and O. minutus (L.) (Hemiptera: Anthocoridae) are locally the predominant natural enemies of these pests. This study compared the functional responses of O. niger and O. minutus to female mites and second instar thrips larvae across a range of prey densities (5, 10, 20, and 40 prey/arena) under controlled conditions of 24 ± 1°C, 50 ± 5% RH and 16:8 h (L:D). The resulting data were appropriately fit to Type II functional response models in four predator-prey interactions, including: (1) O. niger to second instar thrips larvae (a = 0.009 h -1 ; and T h = 1.62 h); (2) O. niger to females mites (a = 0.006 h -1 and T h = 1.28 h); (3) O. minutus to second instar thrips larvae (a = 0.008 h -1 and T h = 1.93 h) and (4) O. minutus to females mites (a = 0.01 h -1 and T h = 1.1 h). The number of second instar thrips larvae attacked by O. niger was greater than that by O. minutus (P B 0.01); conversely, the number of females mites attacked by O. minutus was greater than that by O. niger (P B 0.01). These results confirm the potential for both O. niger and O. minutus to make valuable contributions to a biological control program against onion thrips and the two-spotted spider mites infesting potato fields in this region.