Rate of increase, functional response, and development of Catolaccus grandis (Burks) (Hymenoptera: Pteromalidae) /
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| Other Authors: | , , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1992.
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| Online Access: | Link to OAKTrust copy |
| Abstract: | The reproductive potential of adult females of Catolaccus grandis (Burks) was determined under laboratory conditions at four constant temperatures (25°C, 30°C, 35°C, and 40°C [plus or minus] 1) in groups of 20 individually evaluated females. The resulting data were used to calculate life tables and rates of increase at each temperature. The oviposition means per female of C. grandis were 679.2, 498.8, and 76.2 eggs and the parasitization means were 347.5, 236.0, and 36.1 hosts at 25°C, 30°C, and 35°C, respectively. No eggs were produced at 40°C. The age-dependent fecundity of C. grandis followed a general pattern of three periods: preovipositional, peack fecundity, and reduced fecundity. The net reproductive rate (R[o]) of C. grandis was 58.4, 28.4, and 4.3; the daily intrinsic rate of increase (r[m]) was 0.13, 0.16, and 0.08; and the weekly rate of increase was 1.05, 1.33, and 0.69 at 25°C, 30°C, and 35°C, respectively. Cylindrical field cages enclosing a cotton plant were used to study the functional response of C. grandis. Densities of 2 to 22 infested cotton squares were exposed to a female inside every cage. The data was fitted to models of type I and type II functional response. The instantaneous searching rate (a') in one day was 0.743. The handling time (T[h]) was 0.013 (R^2 = 0.5631; F = 56.03; df = 2, 17; P < 0.001). When the data were analyzed in 3-day age classes, the values of these two parameters varied showing a pattern similar to the age-dependent fecundity. The number of larval instars of C. grandis and their duration was determined at 7 constant temperatures by marking the cuticle with a dye to identify the change of instar. Five larval instars were identified with most of the developmental time occurring in the fifth instar. The mean total developmental time was significantly shorter in males than in females. The females completed development in 38.2, 22.5, 18.7, 15.0, 13.3, and 11.8 days at 18°C, 21°C, 24°C, 27°C, 30°C, and 33°C, respectively. At 36°C they were unable to develop beyond the fifth instar stage. No evidence of development was observed at 39°C. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Entomology." |
| Physical Description: | xiv, 129 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |