The symptoms shown in the slide appear only after approx. one month during storage (not in the field) and only on the peel and not in the fruit flesh. Therefore it cannot be due to calcium or boron deficiency. Any idea ?
Calcium deficiency. the rind of the fruit, and tissue die under these spots and turn to brown, over time, these spots become a bit deep color fabric becomes beneath dark brown and dry then become Vllah.
Delicate skin--gets damaged during harvest/handling, can't see any symptoms until about a month in the cold. Very common, not scald.
These skin damage symptoms are observed in China. Thank you for the last hint that it could be simply due to handling of the delicate skin of Asian pear after bagging and cool storage. We will check this. I myself do not believe in nutrient deficiency as postulated by locally operating fruit advisors.
Thank you for your valuable comments. In the meantime we received fruit analysis results from China and observed a correlation between these symptoms and low calcium content. For example in unaffected fruit a Ca concentration of approx. 1.3 mg/kg dry matter was found while in the fruits with symptoms only 0.6-0.7 g/kg dm could be detected. The other nutrients nutrient were within normal limits. Therefore the suggestion of Dr. Naser seems to have been the right one.
As follows you find the deficiency symptoms of the skin of Nashi pears. After analysis they could be clearly interpreted as localized calcium deficiency similar to bitter pit of apples..
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