Leaves/fruit ratio

It must also be borne in mind that as the number of trees per hectare decreases, each individual tree must bear a significantly higher number of fruit in order to attain the desired yields. Unavoidably, however, this can only be achieved at the expense of fruit quality, especially the internal quality (sugar and acid content and firmness of the flesh). With fewer fruit on the tree, the leaves/fruits ratio improves, and so quality is raised. The specific crop load density (number of fruit per cm of cross-sectional area of trunk) is the determinative factor for fruit quality. 

Vanadium in plants decreases significantly with increasing age. From the beginning of May to the middle of June, vanadium contents were found to abate to a third of the initial level. Vanadium concentrations in several plant species vary with their leaf stalk ratio. Leaves store high amounts of vanadium, whereas the seeds and fruit prove to be particularly poor in vanadium. Moreover, the perennial plants on which game feed in winter have proven to be extremely rich in vanadium (Anke etal. 1998). 

In desert areas of southern California fruit are often injured but leaves are seldom injured by sulfur dust. In coastal areas fruit burn is less marked but leaf burn may be acute. Where the air-vapor density is high, leaf temperatures in the sun may sometimes become higher than fruit temperatures. The leaf, a better absorber of radiation and a better radiator than the fruit, has a higher surface-mass ratio and appears to be very sensitive to the heat trap effect of high vapor density its temperature changes with great rapidity, but fruit temperature may lag until the danger period is passed (18). 

The suggestion that the sex pheromone composition of the oak leaf roller was dependent to a large extent on diet was made 82,475,476) and refuted 477, 478). It is now generally accepted that the sex pheromone of this tortricid moth species is a specific blend (67 33) of E)- - and (Z)-ll-tetradecenyl acetates 477). It is also accepted that in this species this ratio is not influenced by diet 478). However, the effects of diet on the amount of pheromonal compounds have been suggested for the summer fruit tortrix moth 479), the gypsy moth 480) and the smaller tea tortrix moth 481). 

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