Graduate Thesis Or Dissertation

 

Photoperiodic control of development in the leafhopper, Agalliopsis abietaria Oman Public Deposited

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  • Photoperiod controls the duration of both the fourth and fifth stadia in Agalliopsis abietaria Oman. Development was arrested in the fourth stadium unless short days were given during the second and third instars; a short arrest of development occurred if the short days did not begin until the fourth instar. A diapause of long duration in the fifth instar, which overwinters, was induced by giving short days for all nymphal instars. The fifth stadium was minimized by short days during the first one or two instars and long days for the rest of the nymphal period. The earlier in the nymphal period the change from short days to long days was made, the shorter was the duration of the fifth stadium. The ecological significance of the fourth-instar arrest of development is discussed.
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