Predation on eggs and larvae ofHeliothis virescens [Lep.: Noctuidae] by an adult predator complex in cage studies on cotton |
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| Authors: | L G Thead H N Pitre T F Kellogg |
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| Institution: | (1) Mississippi State University, 39762 Mississippi State, Mississippi;(2) Mississippi Agricultural and Forestry Experiment Station, 39762 Mississippi State, Mississippi;(3) Present address: Pennwalt Corporation, 5060 Horn Lake Rd, 38637 Horn Lake, MS |
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| Abstract: | Predation by a predator complex consisting of adults of the lygaeidGeocoris punctipes (Say), the nabidsNabis roseipennis Reuter and/orTropiconabis capsiformis Germar and the coccinelids,Hippodamia convergens Guerin-Meneville andColeomegilla maculata (DeGeer) onHeliothis virescens (F.) eggs, 1st-instar larvae or both on late pinhead square and early bloom stage cotton was evaluated in field cages in
Mississippi. Prey densities of 4 (11, 512/ha) or 8 per cage and predator: prey (P:p) ratios of 1∶1, 2∶1, 3∶1, 4∶1 and 5∶1
were used. Prey were labeled with phosphorus-32 or carbon-14 to determine predator ingestion and effectiveness. Average percent
egg predation as a function of P:p ratio ranged from 2.1 to 12.1 for a 48 h period. The average percent predation on larvae
as a function of P:p ratio ranged from 5.3 to 22.0. The hemiptera fed more than the coleoptera on larvae, andG. punctipes was the best egg predator. For the range of predator densities used, the average area of discovery for the predator complex
was 6.98 × 10−3 m/day and 2.34 × 10−2 m/day when exposed to eggs and larvae, respectively.
Publication No 5936-Mississippi Agricultural and Forestry Experiment Station, Mississippi State, MS 39762. |
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| Keywords: | Predators Heliothis virescens Cotton Phosphorus-32 Predation |
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