0
points
Spots and browning on apple

Apple    iran

Can anybody help me with these spots on apple? Is it a fungal disease or biologic stress or something like spraying? Thank you so much


Posted by: saba (1 point) saba
Posted: September 21, 2015




Answers

1
point
First one looks like apple scab (though symptoms are not clear from the photo). This is a fungal diseases that causes dark, scabby marks on the fruit and leaves of apples, pears and some other ornamental fruits. The causal organism is Venturia inaequalis.

Please follow the link for more information on the disease and management strategy.

https://www.extension.purdue.edu/extm...

Second one may be internal browning. A physiological disorder, thought to result from CO2 injury, has been reported in Fuji, Cox's Orange Pippin, Braeburn and Jonathan apples. The disorder is associated with later harvested, large, and overmature fruit and with CO2 concentrations in storage. Higher concentrations of CO2 result in greater incidence and severity of internal browning. Incidence and severity of this disorder varies season to season and orchard to orchard. The reasons for this variability are unknown but some have suggested an association with cool, wet weather and high nitrogen fertilization.



Posted by: Dr. Ravishankar Narayana (8 points) Dr. Ravishankar Narayana
Posted: September 23, 2015


deactivated commented,
It's hard to tell -- I don't believe this is apple scab (picture on the left); however, the lesion that is on the right side looks suspicious. What does the flesh look like when you cut through a lesion? To know for certain what it is (since it doesn't seem like any obvious culprits): seeing if any fungi can be isolated from the lesions on the fruit. If the right fruit is truly internal browning, then the flesh should have characteristic browning inside the fruit. If that fruit was in storage, it could be storage scald (maybe).
about 4 years ago.



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