Cowpea Plant Architecture in Relation to Infestation and Damage by the Legume Pod Borer, Maruca Testulalis Geyer (Lepidoptera: Pyralidae)—I. Effect of Canopy Structure and Pod Position

Oghiakhe, S.; Jackai, L. E. N.; Makanjuola, W.A.

doi:10.1017/s1742758400020695

Cited by 16 publications

(15 citation statements)

References 6 publications

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“…Similar findings have also been reported by Ke et al (1985), Veeranna et al (1997) and Bachatly and Malak (2001). Oghiakhe et al (1991)obtained a positive correlation of percentage pod damage and larval infestation of M. testulalis in flowers with relative humidity, and negative correlation with temperature. In Maruca testulalis, the mating took place between 21.00 h and 05.00 h when temperature ranged between 20 and 25°C and RH was over 80%, with peak activity occurring between 02.00 and 03.00 h. (Jackai et al, 1990).…”

Section: Resultsmentioning

confidence: 90%

Effect of abiotic and biotic factors on incidence of pests and predator in cowpea[Vigna unguiculata(L.) walp.]

Kumar

2015

Legu. Rese. - An Inter. Jour.

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Field experiments were conducted during Kharif season of 2007-2008. The pest population was recorded in cowpea field aphids, jassid, thrips and pod borer and its highest population 116.20/15 cm shoots tip, 8.6/compound leaves, 5.87/flower bud and 0.73/flower bud and 1.8/pod, respectively. Abiotic factors like temperature, relative humidity, extent and distribution of rainfall, sunshine hour etc. influenced the infestation and stabilization of various insect pests in cowpea. The populations of aphids and pod borer influenced positively relative humidity while those of jassid was affected by temperature and sunshine hour. The negative correlation was found between aphid and maximum temperature, sunshine hour and wind speed; jassid and thrips with relative humidity and pod borer with maximum temperature and wind speed. Coccinella septempunctata was the most abundant predator of cowpea aphid and negatively correlated with aphid population.

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Section: Resultsmentioning

confidence: 90%

Effect of abiotic and biotic factors on incidence of pests and predator in cowpea[Vigna unguiculata(L.) walp.]

Kumar

2015

Legu. Rese. - An Inter. Jour.

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“…The desired angle will naturally have to be a function of other phenetic traits such as canopy structure and pod position (Oghiakhe et al, 1991), erect or prostrate plant habit (Oghiakhe, 1990), as well as the inherent level of genetic resistance. The desired angle will naturally have to be a function of other phenetic traits such as canopy structure and pod position (Oghiakhe et al, 1991), erect or prostrate plant habit (Oghiakhe, 1990), as well as the inherent level of genetic resistance.…”

Section: Discussionmentioning

confidence: 99%

Cowpea plant architecture in relation to infestation and damage by the legume pod borer, Maruca testulalis Geyer (Lepidoptera: Pyralidae) — 2. Effect of pod angle

Oghiakhe

Jackai

Makanjuola

1992

Int. J. Trop. Insect Sci.

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The effect of pod angle on the resistance of cowpea, Vigna unguiculata (L.) Walp. to the legume pod borer, Maruca testulalis Geyer, was investigated under field conditions at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, using two cowpea cultivars: IT82D-716 (susceptible to borer damage) and T Vu 946 (resistant to borer damage). Three different pod angles were used in the study -a normal angle, a decreased angle and an increased angle. Negative and highly significant (P < 0.01) relationships were found between pod angle and per cent pod damage, as well as the seed damage Index In the two cowpea cultivars. Pods with wide angles (5 89°) were damaged on only one and rarely on both pods. Apart from biochemical and other bio-physical factors, selection and breeding for wide pod angle is suggested as a strategy for reducing M. testulalis damage to cowpea pods. Resuml-L'effet de Tangle des gousses sur la resistance du niebe, Vigna unguiculata a la foreuse des gousses, Maruca testulalis a ete Itudie en champ a 1'institut international d'agriculture tropicale (IITA), Ibadan (Nigeria) sur deux cultivars de niebl: IT82D-716 (sensible) et TVu 946 (resistant). Trois angles differents des gousses ont ete Studies: angle ferml, angle normal et angle ouvert.Des relations negatives hautetnent significatives (P < 0.01) furent observers entre Tangle des gousses, le pourcentage de degats sur les gousses et l'indice de degats sur les graines chez les deux cultivars. Dans Tensemble, pour les gousses a angle ouvert (>89°), M. testulalis a occasionne des d£gats sur une seule gousse par plant.La selection et 1'amelioratibn du niebe pour l'obtention de gousses a angle ouvert ont itt sugge>ees comme moyen de reduire les degats de M. testulalis sur les gousses de niebe.

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“…The flowers were placed in vials containing 30% alcohol to allow dislodgement of larvae and were dissected the following day (Amatobi, 1994). The sampled flowers were assessed based on damage characteristics such as presence of entry/exit holes, dirty frass/excretes and presence of life/dead larvae (Abdullahi, 2013, Asiwe et al, 2005Oghiakhe et al, 1991). Number of larvae found in each flower were counted and recorded after dissection.…”

Section: Assessment Of M Vitrta Larval Populations In Flowersmentioning

confidence: 99%

“…Borer damaged pods were separated from the undamaged. Percentage damage was expressed as total number of damaged pods divided by the total number of pods sampled multiplied by 100 (Oghiakhe et al, 1991). Dried pod damage at harvest was assessed by separating the pods based due to Maruca from total pods harvested per plot (Ogah, 2013).…”

Section: Vitrta Pod Damage Assessmentmentioning

confidence: 99%

Maruca vitrata (Fabricius) [Lepidoptera: Pyralidae] larval population dynamics as affected by intra-row spacing, sowing dates and biopesticides on cowpea

Muhammad¹,

Malgwi

Adamu

2017

jsa

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The objective of the research was to test the effect of sowing dates, intra-row spacing and biopesticides on the larval population dynamics of M. vitrata in Samaru, Nigeria. The experiment was laid out with biopesticides (B0; control, B1; Neem seeds kernel extract (NKE), B2; Maruca vitrata Multinucleopolyhedrosis virus (MaviMNPV) suspension and B3; Cyper diforce (30 g cypermethrin + 250 g dimethoate). The result at 10 WAS showed that varying sowing dates to SD3 significantly (P=.01) reduced mean population of M. vitrata larva in sampled flowers in all the years and the combine. MaviMNPV was effective in reducing pod borer populations (7.22, 6.11 and 6.67) better than NKE (10.19, 5.74 and 7.96) and Cyper diforce (7.41, 8.89 and 8.15). The control significantly recorded the highest mean (11.67, 12.59 and 12.13) population in all the years and the combined. Similarly, varying sowing dates to SD3 significantly reduced mean population (5.56, 5.00 and 5.28) of M. vitrata in cowpea pods sampled 10 WAS better than SD1 and SD2. Statistically similar effect of biopesticides was observed on mean population of M. vitrata, however, the control recorded the highest mean (22.59 and 13.89) in 2015 cropping season and the combined. High cowpea grain yield was obtained in SD2 (337.85, 689.10 and 800.66 kg ha -1 ) even though statistically similar with SD3 (244.89, 618.10 and 639.68 kg ha -1 ). Cyper diforce treated plots gave the highest yield of 394.56, 887.69 and 976.51 kg ha -1 during 2015 and 2016 cropping seasons and combine but was statistically at far (P=.01) with NKE and MaviMNPV. The interaction of SD2 and Cyper diforce gave the highest grain yield. The effect of sowing at SD2 and insecticide spray will give a better control of M. vitrata for an increased yield of cowpea in the study area.

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Cowpea Plant Architecture in Relation to Infestation and Damage by the Legume Pod Borer, Maruca Testulalis Geyer (Lepidoptera: Pyralidae)—I. Effect of Canopy Structure and Pod Position

Cited by 16 publications

References 6 publications

Effect of abiotic and biotic factors on incidence of pests and predator in cowpea[Vigna unguiculata(L.) walp.]

Effect of abiotic and biotic factors on incidence of pests and predator in cowpea[Vigna unguiculata(L.) walp.]

Cowpea plant architecture in relation to infestation and damage by the legume pod borer, Maruca testulalis Geyer (Lepidoptera: Pyralidae) — 2. Effect of pod angle

Maruca vitrata (Fabricius) [Lepidoptera: Pyralidae] larval population dynamics as affected by intra-row spacing, sowing dates and biopesticides on cowpea

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