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RISS 인기검색어
- 검색키워드
- 저자 : MOHAMMAD MOSHAROF HOSSAIN BHUYAIN (검색결과 1 건)
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MOHAMMAD MOSHAROF HOSSAIN BHUYAIN 안동대학교 2015 국내박사
GENERAL ABSTRACT INTER-SPECIFIC RELATIONSHIP OF TWO SYMPATRIC THRIPS, Frankliniella occidentalis (PERGANDE) AND Frankliniella intonsa (TRYBOM) (THYSANOPTERA: THRIPIDAE) MOHAMMAD MOSHAROF HOSSAIN BHUYAIN MAJOR IN APPLIED ENTOMOLOGY DEPARTMENT OF BIORESOURCE SCIENCES ANDONG NATIONAL UNIVERSITY The western flower thrips, Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) and the garden thrips, F. intonsa (Trybom), are flower-inhabiting thrips infesting many crops of agricultural importance. By direct damage as well as tospovirus transmission, thrips cause significant economic loss worldwide. Asymmetrical seasonal occurrence and distribution pattern of F. intonsa dominate over F. occidentalis was found regionally in Andong in recent years. I surveyed dynamics of thrips populations on greenhouse strawberry by installing sticky cards and on field pepper by destructive flowers sampling during the season of 2012, 2013, and 2014 at Songcheon in Andong. F. intonsa was 5.8, 9.4, and 120.5 times more abundant on pepper flowers while 34.7, 25.3 and 14.4 times in greenhouse strawberry than F. occidentalis in 2012, 2013 and 2014, respectively. In the second experiment, I assessed relative insecticide susceptibility of both species to explain the differential occurrence pattern in the field. Acute toxicity of F. occidentalis and F. intonsa to different pesticides was measured in laboratory condition by using direct spray, residual, and oral assays. Results showed that both species were highly sensitive to chlorfenapyr, and its mortality reached 100% within 12 h irrespective of assay methods in F. occidentalis, but the time to death was shorter (9 h) in direct spray and residual assay in F. intonsa. As another hypothesis to explain the differential occurrence pattern, I evaluated interactive influence of temperatures (20, 25, and 30°C) and relative humidities [Low (50-55%), Medium (70-75%), and High (90-95%)] on larval, pupal, and adult stage of two thrips species in the third chapter. In larval survivorship experiment, considering all temperatures and RHs, F. intonsa larvae survived shorter period of time than F. occidentalis. The median longevity time values of F. occidentalis larvae were higher than F. intonsa at all the tested temperatures and RHs. Survival period of larvae of both thrips generally increased with increasing RH expect 20°C at high humid condition for F. intonsa. In pupal mortality and its’ duration of both species decreased as the relative humidity (RH) increased in all the temperatures tested, while it was significantly shorter in F. intonsa (pupal period). In adult stage, F. intonsa survived better than F. occidentalis and exhibited 2.5 and 2.4 times longer lifespan whereas F. occidentalis extended the lifespan by 1.8 and 1.6 times as RH increased from low to high at 20 and 25°C, respectively. In the fourth chapter, I evaluated the existence of interspecific competition between the two species in the laboratory by providing honey or pollen as food source. Five behavioral parameters were recorded: confronting, wandering, resting, food guarding, and feeding. Results showed that adult F. intonsa spends more time in guarding and feeding on both honey and pollen than F. occidentalis, although such a pattern was not observed in the larval stage. In the presence of opponent, guarding and feeding time (in seconds) of adult F. intonsa was 8.45 and 1.45 times longer on honey and 42.76 and 1.33 times longer on pollen than F. occidentalis, respectively. From these results I conclude that both interference and exploitation competition occur between F. occidentalis and F. intonsa and that F. intonsa is better at feeding and guarding food sources, especially in the adult stage. As continuation of the competition experiment, effect of the competition on adult reproduction and longevity of the two thrips species was assessed in leaf cage and micro-tube arena, respectively in the fifth chapter. The number of reproduced progeny was reduced by 79% for F. occidentalis and only 43% for F. intonsa in competition condition. The mean longevity was also reduced greater in F. occidentalis (by 41%) than in F. intonsa (23%). With kidney bean leaves, area of feeding marks on bean leaf made by both F. intonsa and F. occidentalis (competition condition) was not significantly different from those made by each species alone (no-competition condition). These results verify that interference competition exists between the two species Therefore, interspecific competition might affect field occurrence pattern of the two thrips species. Key words: Frankliniella occidentalis, Frankliniella intonsa, asymmetrical seasonal occurrence, population dynamics, competition, climate change, body water retention ability, anthophilous thrips, Thripidae, clip cage design, food guarding, feeding, invasive species.
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