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A new host and distribution record for the black coccinellid, Stethorus aptus Kapur (Coccinellidae: Coleoptera)
© The Author(s) 2018
Received: 27 February 2018
Accepted: 7 June 2018
Published: 27 June 2018
The black Coccinellid species Stethorus aptus Kapur was identified as a predator on the European red mite, Panonychus ulmi (Koch.) for the first time. The S. aptus was also reported for the first time in India. Adults of this coccinellid species were black colored and oval or slightly ovate in shape, and its body covered with numerous white setae. The grubs and adults were found actively feeding on P. ulmi in apple and almond orchards in Kashmir region of India.
The European red mite, Panonychus ulmi (Koch.), is a very serious pest of temperate fruit crops throughout the world and inflicts heavy losses. The indiscriminate use of broad spectrum pesticides is the main cause for Panonychus ulmi outbreaks by way of development of resistance and suppression of natural enemies (Cross and Berrie 1994). Any long-term commitment to pure chemical approach is unsatisfactory and has necessitated focusing research on other methods, especially biological control (Rather and Bano 2008). The species of the tribe Stethorini Dobzhansky (genera Stethorus Weise and Parastethorus Pang and Mao) are the specialist mite predators in the family Coccinellidae (Biddinger et al. 2009). Earlier, the genus Stethorus and Parastethorus were placed under the tribe Scymnini. But now, it belongs to the monogeneric tribe Stethorini. The Stethorini were unique from all other Scymninae due to their convex anterior margin of the prosternum and truncate clypeus near the antennal bases (Gordon 1985). The genus Stethorus is distributed throughout the world in many different climates ranging from tropical rainforests to temperate deciduous forests and plains to colder northern regions of Europe, Canada, and Russia (Chazeau 1985; Biddinger et al. 2009).
The adults and larvae of Stethorus spp. are specialized predators of spider mites (Tetranychidae) and closely related to false spider mite or flat mites (Tenuipalpididae) (Chazeau 1985). Khajuria (2009) reported that S. punctum LeConte was one of the efficient predators associated with phytophagous mites in India. The European red mite, P. ulmi was found infesting on apple and almond orchards in Kashmir Valley (32.17–36.55° N, 75.32–75.76 °E, 1700 MASL) of Jammu and Kashmir in India. An extensive survey was conducted during March to November 2011, for the collection of natural enemies of P. ulmi, with particular focus on Coccinellids. The collected specimens were sent to the National Bureau of Agriculturally Important Insects, Bangaluru, India, for species identification. After identification, the specimens were deposited in the National Bureau of Agriculturally Important Insects, Bangaluru, India.
Stethorus predators of Panonychus ulmi of the world
S. bifidus Kapur
Apple, Plum, Pear
S. darwini (Brethes)
S. gilvifrons (Mulsant)
Haji-zadeh et al. 1993
S. punctillum Weise
McMurtry et al. 1970
Pasqualini and Antropoli 1994
S. punctum punctum (LeConte)
McMurtry et al. 1970
S. vagens (Blackburn)
Checklist of the genus Stethorus from India
Scymnus gilvifrons Mulsant 1850: 995
Scymnus (Stethorus) gilvifrons: Weise 1885: 74
Stethorus gilvifrons: Korschefsky 1931: 112
India, Pakistan, Italy, Cyprus
indira Kapur transferred to Parastethorus by Slipinski 2007
Stethorus keralicus Kapur 1961: 35
Stethorus parcepunctatus Kapur 1948: 312
Scymnus pauperculus Weise 1895: 155
Stethorus pauperculus Weise 1900: 440
India, Pakistan, Malaysia and Thailand
Stethorus rani Kapur 1948: 313
India, China, and Thailand
The attractive characteristics of Stethorus for mite biological control were their prey consumption, longevity, and high reproductive capacity (Biddinger et al. 2009). Hence, there is an immediate need for further studies on biology and ecology, with special preference on their predatory potential and effects of miticides or pesticides. These studies are necessary in order to promote them as a potential biological control agent on mites. There is a need for better knowledge of their requirements, including utilization of alternative foods, refuges for dormancy and from nonselective pesticides, and host-finding mechanisms as stated by Biddinger et al. (2009). These studies would help in integrating pest management strategies with inclusion of S. aptus as one of the biocontrol agent in management of European red mite among temperate fruits crops.
We thank Dr. J. Poorani (National Bureau of Agriculturally Important Insects, Bangaluru, India) for the identification of the coccinellid species.
This paper is funded by the ICAR-Central Institute of Temperate Horticulture, Srinagar, Jammu and Kashmir, India.
Both authors read and approved the final manuscript.
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