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Pod wall trichomes and resistance of two wild cowpea, Vigna vexillata, accessions to Maruca testulalis (Geyer) (Lepidoptera: Pyralidae) and Clavigralla tomentosicollis Stal (Hemiptera: Coreidae)

, : Pod wall trichomes and resistance of two wild cowpea, Vigna vexillata, accessions to Maruca testulalis (Geyer) (Lepidoptera: Pyralidae) and Clavigralla tomentosicollis Stal (Hemiptera: Coreidae). Bulletin of Entomological Research, 794: 595-605

Experiments were conducted to investigate the role of pubescence in the resistance of 2 wild cowpea (Vigna vexillata) varieties, TVNu 72 and TVNu 73, to feeding and damage caused by 2 cowpea (V. unguiculata) pests, Maruca testulalis and Clavigralla tomentosicollis. The fine structure of the trichomes was also studied by electron microscopy in order to try to determine the role played by trichomes in the resistance of these varieties to both pests.

Accession: 001912204

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Related references

Oghiakhe, S.; Jackai, L.E.N.; Hodgson, C.J.; Ng, Q.N., 1993: Anatomical and biochemical parameters of resistance of the wild cowpea, Vigna vexillata Benth (Acc. TVNu 72) to Maruca testulalis Geyer (Lepidoptera: Pyralidae). The anatomical and biochemical basis of resistance of Vigna vexillata (Acc. TVNu 72) to Maruca testulalis [M. vitrata] was investigated. An uncharacteristic network of fibrous structures was observed on the petal surface of TVNu 72, but not on tha...

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Koona, P.; Jackai, L.E.N., 2004: The potential of pod-shaving in studies of the role of trichomes in Vigna resistance to the pod-bug Clavigralla tomentosicollis Stal (Hemiptera: Coreidae). Two shaving methods, one by using a sharp razor blade and the other a small pair of dissecting scissors, were tested on pods of Vigna vexillata accessions to investigate the effect of trichomes on feeding and development of the pod-bug Clavigralla...

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Olatunde, G.O.; Odebiyi, J.A.; Chiang, H.S.; Jackai, L.E.N., 1991: Identification of sources of resistance in cowpea vigna unguiculata l. walp. to clavigralla tomentosicollis stal. hemiptera coreidae. Thirty-six cowpea cultivars were evaluated for their resistance to the pod-sucking bug, Clavigralla tomentosicollis Stal. in the screenhouse and in field experiments. Absolute resistance was not found in any of them, although cultivars with relati...

Jackai, L.E.N.; Nokoe, S.; Tayo, B.O.; Koona, P., 2001: Inferences on pod wall and seed defences against the brown cowpea coreid bug, Clavigralla tomentosicollis Stal. (Hem., Coreidae) in wild and cultivated Vigna species. Studies were conducted in the laboratory to investigate the different components of the resistance of Vigna vexillata (accession TVnu 72) and several cultivars of Vigna spp. to infestation and damage by the brown cowpea coreid, Clavigralla tomento...

Koona, P.; Osisanya, E.O.; Jackai, L.E.N.; Tamo, M.; Reeves, J.; Hughes, J.D.A., 2002: Pod surface characteristics in wild and cultivated Vigna species and resistance to the coreid bug Clavigralla tomentosicollis stal. (Hemiptera: Coreidae). Several Vigna species were used to determine the role of pod trichomes and pod toughness in the resistance of cowpea to feeding damage by the coreid bug Clavigralla tomentosicollis Stal. The scanning electron microscopy study revealed the presence...

Jackai, L.E.N., 1982: A field screening technique for resistance of cowpea (Vigna unguiculata) to the pod-borer Maruca testulalis (Geyer) (Lepidoptera: Pyralidae). A method for screening resistance of cowpea (Vigna unguiculata) to the legume pod-borer Maruca testulalis (Geyer) was developed. Several damage parameters were measured, including damage to stem, flowers, pods and seeds. Some of these parameters w...

Oghiakhe, S., 1998: Cowpea (Vigna unguiculata) plant architecture and resistance to the legume pod borer, Maruca testulalis Geyer (Lepidoptera: Pyralidae). The effects of plant architecture on cowpea (Vigna unguiculata) resistance to Maruca testulalis [M. vitrata] are discussed in relation to integrated pest management. Recent studies have shown that, in combination with other traits that confer resi...

Veeranna, R.; Hussain, M.A., 1997: Trichomes as physical barriers for cowpea pod borer Maruca testulalis (Geyer) (Lepidoptera: Pyralidae). Of 45 cowpea genotypes screened for attack by Maruca testulalis [M. vitrata] in Karnataka, India, the most resistant (TVX-7) had a high trichome density (24.41/9 mmsuperscript 2), while the most susceptible (DPCL-216) had a low trichome density (1...