Response of the onion (Allium cepa L.) plant to simulated Pest damage

The effect of the different levels of damage on each leaf at various crop growth stages on weight and size of onion bulb was investigated in farmers' fields in Bongabon and Talavera, Nueva Ecija [Philippines] from December 2000 to April 2003. In 2001 and 2002, simulated damage was done by cutti...

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Published inPhilippine Entomologist (Philippines) Vol. 18; no. 2
Main Author Arida, G.S, Ravina, C.S., Punzal, B.S, Rajotte, E.G., Talikar, N.S.(Philippine Rice Research Inst., Muñoz, Nueva Ecija (Philippines). Integrated Pest Management-Collaborative Research Support Program)
Format Journal Article
LanguageEnglish
Published 01.10.2004
Subjects
AGRICULTEUR
AGRICULTORES
allium cepa
BULBE
BULBO
bulbs
damage
DANOS
DEFOLIACION
defoliation
DEGAT
developmental stages
DIMENSION
dimensions
ETAPAS DE DESARROLLO
EXPERIMENTACION EN CAMPO
EXPERIMENTATION AU CHAMP
farmers
FEUILLE
field experimentation
FILIPINAS
HOJAS
leaves
PESO
philippines
POIDS
STADE DE DEVELOPPEMENT
weight
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Summary:The effect of the different levels of damage on each leaf at various crop growth stages on weight and size of onion bulb was investigated in farmers' fields in Bongabon and Talavera, Nueva Ecija [Philippines] from December 2000 to April 2003. In 2001 and 2002, simulated damage was done by cutting of part of each leaf to the desired level. Simulated damage of up to 75% at 15 days after transplanting (DAT) had no significant effect on onion bulb size and weight in both sites.The bulb formation stage (45-65 DAT) was sensitive to any level of simulated damage as shown in the measured yield components. In 2002, artificialdefoliation of up to 25% at 15 DAT and 10% at 30 DAT had no effect on bulb size and weight. In 2003, the effect of cutting off 1,2 or 3 leaves asthe youngest leaf at different crop ages on onion bulb size and weight was also investigated. removal of most, if not all, the leaves (3leaves) at 15 DAT resulted in a significant reduction in onion bulb size and weight in both locations. Similar result was recorded when the youngest leaf was removed at 60DAT. removal of only the oldest leaf at 15,30,45 or 60 DAT generally did not affect bulb size and weight. Results of this study suggest that onion plants can tolerate some damage caused by defoliators.
Bibliography:H10
PH
ISSN:0048-3753