Two types of cracks may develop on tomato fruit. Radial growth cracks radiate from the stem, and concentric cracks encircle the fruit, usually on the shoulders.
Similar to blossom end rot, cracking is associated with rapid fruit development and wide fluctuations in water availability to the plant. Fruit that has reached the ripening stage during dry weather may show considerable cracking if the dry period is followed by heavy rains and high temperatures.
Tomato varieties differ considerably in the amount and severity of cracking under climatic conditions. Supersonic and Jetstar are two varieties that show relatively low incidence of cracking. As with blossom end rot, mulching and avoiding heavy applications of nitrogen fertilizer should help reduce fruit cracking.
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