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Yield Loss Assessment and Economic Injury Level for the Leaf Miner Aproaerema Modicella (Deventer) (Lepidoptera:Gelechiidae) on Soyabean in India

  • M. Kalayanasundaram
  • Sellammal Murugesan
Research Article

Abstract

In experiments to find the yield loss in soyabean due to the leaf miner, Aproaerema modiceüa (Deventer) and estimate the economic injury level (EIL), plants were infested at 30 and 45 days after sowing (DAS) with a fixed number of laboratory reared second instar larvae.

Grain yield was not reduced by one larva per plant at both 30 and 45 DAS, but the yield reduction which ranged from 2.7 to 6.1 % was significant with two larvae per plant at both the ages. With an increase in larval population, there was a corresponding decrease in yield to the extent of 40% and 66% with 10 larvae/plant at 30 and 45 DAS respectively.

The regression of yield of leaf miner infestation indicated that yield was reduced by 0.463 and 0.716 g per plant for every larva per plant at 30 and 45 DAS respectively. Yield loss was greater in plants infested at 45 DAS than at 30 DAS with all populations tested.

The estimated economic injury level for A. modicella Is 0.6 larva/plant at 30 DAS, and 0.2 larva/ plant at 45 DAS. The suggested economic threshold level In soyabean of 85–90 days duration is 0.5 larva/plant (1 larva/2 plants) at 30 DAS and 0.2 larva/plant (1 larva/5 plants) at 45 DAS.

Key Words

Leaf miner Aproaerema Modicella economic injury level yield loss 

Résumé

Chez les expériences pour rechercher la perte en rendement au soja à cause du mineur de feuille Aproaerema Modicella (Deventer) et apprécier le niveau du dommage économique (NDE) on a empesté les plantes le 30 e et le 45 e jours après ensemencement (JAE) avec un certain nombres des larves de deuxième stade enlevées aux laboratoire.

Le rendement du grain n’a pas été ramené avec une larve par plante aux 30 et 45 e JAE. Mais la diminution en rendement qui a étage de 2,7 % à 6.1 % a été significative seulement avec deux larves par plante aux tout les deux âges. Avec une augmentation de la population des larves il y avait un décroissement correspondant jusqu’à 40% et 66% avec 10 larves/plante aux 30 et 45 e JAE respectivement.

La régression du rendement sur I’infestation par le mineur de feuille a indiqué que le rendement avait ramené jusqu’à 0, 463 et 0, 716 g par plante pour chaque larve par plante aux 30 et 45 e JAE respectivement. La perte du rendement était plus élevée aux plantes infectué au 45 e JAE que celles du 30 e JAE avec toutes les populations expérimentées.

Le NDE estimé pour A. modicella est 0,6 larve/plante au 30 e JAE et 0, 2 larve/plante au 45 e JAE. Le seuil économique suggesté pour le soja de 85 à 90 jours de durée est 0, 5 larva/plante ou 1 larve/ 2 plantes au 30 e JAE et 0, 2 larve/plante ou 1 larve/5 plantes au 45 e JAE.

Mots Cléfs

Mineur de feuille Aproaerema Modicella niveau du dommage économique perte du rendement 

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References

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Copyright information

© ICIPE 1989

Authors and Affiliations

  • M. Kalayanasundaram
    • 1
  • Sellammal Murugesan
    • 1
  1. 1.Centre for Plant Protection StudiesTamil Nadu Agricultural UniversityCoimbatoreIndia

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