QUANTIFYING YIELD LOSS OF AUBERGINE (SOLANUM MELONGENA L.) INDUCED BY LEAF AREA REDUCTION
The foliar area loss is a typical damage in crops caused by fungus, insects or hailstorm. A lot of studies have been carried out to describe the effect of defoliation in the main herbaceous and woody crops. The results of two trials carried out in Navarra (Spain) in 2007 to determine the effects of different levels of defoliation in several phenological stages in aubergine plants are described in this work. In a randomly split-plot design with four replications, four levels of defoliation were applied: control, slight, moderate and heavy, at six phenological stages of aubergine plants var Nilo (Rijk Zwaan). Defoliation was made by means of a jet of water under pressure in one trial and, by means of scissors in the other one. Fruits were harvested on three occasions and classified as marketable and unmarketable yield and were weighed. The BBCH stages 71 (the first fruit reaches the typical size) and 86 (60% of fruits reach the typical size, shape and colour) were the most sensitive stages for water defoliation and scissor defoliation respectively. These experimental results were used to obtain regression equations in which the percentage of yield reduction is calculated in relation with the stage and the percentage of defoliation. These equations were plotted and maximum loss of 77% in defoliation by scissor and 64% in defoliation by water were observed for 100% of defoliation. These equations can be used to improve simulation patterns of the aubergine growth in case of foliar damages caused by fungus, insect attacks or hailstorm.
Domeño, I., Irigoyen, I. and Muro, J. (2012). QUANTIFYING YIELD LOSS OF AUBERGINE (SOLANUM MELONGENA L.) INDUCED BY LEAF AREA REDUCTION. Acta Hortic. 932, 413-419
eggplant, damages, hailstorm, simulation