Predation by three hemipterans:Tropiconabis nigrolineatus,Oechalia schellenbergii andCermatulus nasalis,onHeliothis punctiger larvae in two types of searching arenas |
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Authors: | M S Awan |
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Institution: | (1) Department of Entomology, Waite Agricultural Research Institute, Adelaide, South-Australia;(2) Present address: Department of Zoology, University of Sind, Jamshoro, Pakistan |
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Abstract: | Three species of hemipteran predators preyed differently upon 1st instarHeliothis punctiger Wallengren larvae.Cermatulus nasalis consumed more larvae thanOechalia schellenbergii which consumed more larvae thanTropiconabis nigrolineatus. All the species consumed significantly less 1st instar larvae on plants than what they consumed in Petri-dishes. Fifth instar predators showed significant differences in
terms of prey consumption due to sex independent of searching conditions. Only 4th and 5th instars ofT. nigrolineatus attacked and captured 2nd instars ofH. punctiger larvae. The other 2 species however readily attacked and consumed 2nd instarH. punctiger larvae. Their prey consumption was similar in Petri-dishes and on plants.
Only 5th instars ofT. nigrolineatus could subdue and capture 3rd instarH. punctiger larvae. Second instar pentatomids captured just one 3rd instar larva but older instars killed and ate more. Fourth instarH. punctiger larvae were immune to attacks by allT. nigrolineatus and younger pentatomids due to their defense ploys but 5th instar pentatomids could subdue and capture them.
None of the predators captured 5th instarH. punctiger larvae except few 5th instar females ofC. naslis andO. schellenbergii.
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Keywords: | Comparative predation Oechalia schellenbergii Cermatulus nasalis Tropiconabis nigrolineatus native budworm searching arena |
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