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kevin
Base of my tomatoes ( stem end ) is yellow and woody when ripe.( not sunburn. )

Tomato plants are strong and healthy, they grow above 2.3m high. I don't know the variety but they have very large fruit, biggest one so far is 1.5kg ( but not this year )very common to pick fruit over 500gms.They are regular watered with watering system,fertilised & mulched. i regularly dust and spray. This problem has been occuring for some seasons even though i change their position every year.

Submitted: 02:55PM, 05 Feb 2010
Answer: Dear Kevin,

This is likely to be a non-pathological disorder of tomatoes called concentric ring and radical cracking. It affects some cultivars more than others. It can be associated with drastic weather changes such as warm fine weather following rain or moist atmospheric conditions following rain or heavy dews.

The stem end of the fruit has either cracks radiating out from the stem scar across the shoulder of the fruit or concentric ring crack around the stem end shoulder. Scar tissue usually has healed the cracks causing discolouration of the crack and immediate skin tissue.

This disorder is more prevalent in varieties that expose their fruit to the elements than varieties that cover their fruit. Moisture is absorbed through the stem scar causing internal expanion of the fruit leading to skin cracking.

When growing tomatoes it may be advisable to choose a variety of tomato which has a bushy foliage which does not leave fruit exposed. Care should be taken with watering in order to maintain a consistent moisture level available to the tomato bush.

Answered: 09:36AM, 09 Feb 2010

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