Graduate Thesis Or Dissertation
 

Effect of temperature and photoperiod on growth and development of the filbert leafroller, archips rosanus L. (lepidoptera: Tortricidae) in the Willamette Valley of Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/db78tf35v

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  • Role of temperature and photoperiod on development of the filbert leafroller, Archips rosanus L., (Lepidoptera: Tortricidae) from the Willamette Valley, Oregon was studied in the laboratory and in the field. Both temperature and photoperiod had a significant influence on the developmental rate of this species from neonate larva to adult eclosion. Developmental thresholds and thermal unit (TU) requirements for different larval instars and the pupal stage were determined for males and females, separately and combined. Egg stage and the first larval instar had the highest thermal thresholds of 7.13 °C and 6.77 °C, respectively, while the fifth larval instar had the lowest thermal threshold (4T). A total of 350.63 TU was required for development from the first instar to pupation and a total of 496.65 TU was required for development from larva to adult eclosion. Pupae Redacted for Privacy required 147.13 TU. Diapause in A. rosanus is expressed in the egg stage and is induced through obligatory genetic mechanisms with undefinable control of environmental cues. Attempts made to assess the role of photoperiod and temperature on diapause induction under laboratory conditions indicated no influence of environmental factors on diapause induction. Chilling is required for diapause development. Effects of photoperiod at different temperatures on oviposition, adult longevity and fecundity of A. rosanus, were examined under laboratory conditions. Data indicated that both temperature and photoperiod had a significant (P > 0.01) influence on adult longevity. Temperature had a dominant effect on fecundity, while photoperiod was less important. The seasonality of A. rosanus studied during a three year period (1992-1994) under field conditions, showed that larval hatch from the diapausing eggs began between the second and third week of March and larval development was completed in 511 weeks. Initial adult emergence occurred from May 31 to June 5 and required 496 TU. An average of 2.5 days was required between first female emergence and oviposition. Peak oviposition was noticed in the second week of June at 636 TU. The adult life span averaged 17 days. Based on a three year record of pheromone trap catches, an adult phenology model was developed and predictions were validated with a high degree of accuracy during 1994.
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file details ZabidiAhmedHizam1995.pdf 2017-08-04 Público Baixar