BLACK HEART OF POTATO EndPrevious Next. Black heart of Potato It is an important storage, transit...
-
Upload
valerie-curtis -
Category
Documents
-
view
212 -
download
0
description
Transcript of BLACK HEART OF POTATO EndPrevious Next. Black heart of Potato It is an important storage, transit...
BLACK HEART OF POTATO
End Previous Next
Black heart of Potato
It is an important storage , transit and market disease of potato tubers as a result of poor oxygen relations. The disease occurs in poorly ventilated room in closely packed condition.
Cross section of infected tubers
End Previous Next
Black heart of Potato
It also occurs in the field when temperature of soil goes above 320C during growth and maturation of tubers.
The disease occurs in transit when the temperature inside the carrying vans rises for sometimes above 320C
End Previous Next
Symptoms:
Dark grey to purplish or blue black discolouration in irregular pattern in the central portion of tubers.
Large tubers are more susceptible to black heart.
End Previous Next
Discoloured tissues are firm but on exposure to room temperature it become soft and inky
In advance stages the affected tissues dry out and shrinks with formation of cavity in the centre of the tuber. End Previous Next
Cause It is a non pathogenic disease .
Black heart develops when oxygen is excluded or unable to reach internal tuber tissues.
It develops more rapidly between 00C and 2.50 C than at 50C
At temperature of 360C -400 C or of 00C or slightly below black heart may also develops because of less gas diffusion through the tissues of tubers.
End Previous Next
Post harvest – Poor Ventilation, Temps below 0 0C or above 33 0C in storage or transit
End Previous Next
Management
Store the tubers in well ventilated rooms and the bags of tubers should not be piled very high upon each other.
Provide sufficient aeration during storage.
Do not expose tubers to high temperature nor to prolonged storage near 00C.
In the field if the soil temperature goes very high( above 320C) during maturation of tubers should be irrigated.
End Previous Next