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BRUSSELS SPROUT
4.4 PHYSIOLOGICAL DISORDERS
Brussels sprouts show various non-parasitic disorders which cause tissues to die off. In some
cases, these deviations have been shown to depend mainly on heritable characters; whereas in
other cases external factors had a least marked effect.

Tip Burn of Brussels Sprouts
This problem can cause severe economic losses. Internal leaves turn brown, especially on the
edges or tips. Inside sprouts, the centre tissues often breakdown. It is a physiological disorder
which is associated with an inadequate supply of calcium to the young, actively growing inner
leaves. High humidity, low soil moisture, high potassium, high nitrogen, or low soil calcium all
influence calcium availability.

Internal Browning
In Brussels sprouts, the symptoms are a yellowing of the distal ends of the leaves within the
sprout, generally on a line through the centre region of the sprout and midway between its
growing point and exterior surface. From a practical aspect, internal browning is especially
troublesome because it cannot usually be detected from external examination of the sprouts, yet
quite a small number of affected sprouts may taint a large sample; especially when they are
blanched for quick-freezing.

Factors which have contributed to internal browning have done so by bringing about a temporary
localized calcium deficiency in the sprouts. Rapid growth, low soil moisture and high relative
humidity, which inhibit transpiration, are commonly implicated. The actual soil calcium levels
have very little influence unless they are extremely low.

Ensuring the soil moisture is close to field capacity can reduce the risk of internal browning.
Excessive nitrogen fertilizer should be avoided. Foliar sprays of calcium nitrate may prevent the

onset of internal browning if applied before the onset of adverse growing conditions. \

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