Population dynamics of thrips (Thysanoptera: Thripidae: Phlaaeothripidae) inhabiting Vaccinium (Ericales: Ericaceae) galls in Georgia
1996
Braman, S.K. | Beshear, R.J. | Payne, J.A. | Amis, A.A.
Thrips inhabiting leaf galls on noncultivated Vaccinium species were surveyed throughout Georgia. Frankliniella caudiseta Sakimura & O'Neil was present on V. tenellum Aiton and V. myrsinites Lam. Blueberry thrips, Frankliniella vaccinii Morgan, was only collected from V. arboreum Marsh. Catinathrips similis Nakahara occurred on V. tenellum and V. myrsinites. However, C. vaccinicola Nakahara was collected only on V. aboreum. Haplothrips rectipennis Hood, a predaceous species, was found on all Vaccinium species. F. vaccinii and C. vaccinicola were both capable of initiating gall formation on plants in the spring. Both species may coexist in the same gall and are univoltine on mature growth during a season. However, in cutover areas where new plant growth was generated the summer, 1 additional generation was produced. Adult terebrantians became active during April. Larvae were abundant during May and June. On 2nd-growth plants. Larvae were abundant during July and August and adults were collected in October. The predator H. rectipennis colonized galls during May. Larvae of this species became abundant during May and June. One generation was produced. Adults remained in the galls until leaves dropped from the plants, usually in October. Thrips significantly reduced shootlength, bud formation, and fruit production of both V. arboreum and V. myrsinites. These observations have implications for blueberry plant improvement efforts.
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