Experimental and Applied Acarology (2021) 83, 183-195

Khatere Mohammadi, Seyed Ali Asghar Fathi, Jabraeil Razmjou and Bahram Naseri (2021)
Evaluation of the effect of strip intercropping green bean/garlic on the control of Tetranychus urticae in the field
Experimental and Applied Acarology 83 (1), 183-195
Abstract: In this study, the effect of strip intercropping green bean (GB), Phaseolus vulgaris L., with garlic (G), Allium sativum L., in three row ratios (3GB:5G, 3GB:8G and 3GB:11G) was assessed on two-spotted spider mite (TSSM), Tetranychus urticae Koch, compared with green bean sole crop over two growing seasons, in 2017 and 2018. The results indicated that intercrops reduced the densities of T. urticae eggs and mobile forms on the vegetative growth, the flowering, and the bean expansion stages of green bean plants compared with sole crop. In this study, seven predators of T. urticae including Stethorus gilvifrons (Mulsant), Orius niger (Wolff), Neoseiulus zwoelferi (Dosse), Chrysoperla carnea (Stephens), Geocoris punctipes (Say), Scolothrips sexmaculatus Pergande, and Nabis pseudoferus (Remane) were collected on TSSM-infested green bean plants during the two growing seasons. Among them, S. gilvifrons and O. niger were the main predators of TSSM on green bean plants in the two growing seasons. Furthermore, the densities of O. niger were significantly higher in intercrops on the vegetative growth and the flowering stages of green bean compared with sole crop, whereas no significant difference was observed in the densities of S. gilvifrons between intercrops and sole crop in 2017 and 2018. Moreover, the values of the Shannon diversity index (H' ) and Pielou's evenness index (J' ) for the composition of TSSM predators were greater in the three intercrops compared with sole crop for the entire growing seasons 2017/2018. On the other hand, the land equivalent ratio (LER), which is used to assess the yield benefit in intercrops, was greater than one in intercrops, especially in the 3GB:5G ratio (1.29 in 2017 and 1.40 in 2018). These results indicated that strip intercropping green bean with garlic could be effective in the control of T. urticae in green bean fields.
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Link to article at publishers website
Database assignments for author(s): Jabraeil Razmjou, Bahram Naseri

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tetranychus urticae	Beans (Phaseolus)	Iran
Orius niger (predator)	Tetranychus urticae	Beans (Phaseolus)	Iran
Stethorus gilvifrons (predator)	Tetranychus urticae	Beans (Phaseolus)	Iran