Minimum isolation distance of five meter is to be given for foundation-I, foundation-II and certified seed crop from the fields of other varieties and also the fields of the same varieties not confirming to varietal purity requirements for certification.

 

Factor	Stage	Maximum permissible limits
		Foundation-I	Foundation-II	Certified
Off-types	1st and 2nd inspection	0.05%	0.05%	0.10%
Plants showing symptoms of :
Mild mosaic	1st and 2nd inspection	1.0%	2.0%	3.0%
Severe mosaic, leaf roll and yellows	1st and 2nd inspection	0.5%	0.75%	1.0%
*Total virus	1st and 2nd inspection	1.0%	2.0%	3.0%
**Plants infected by brown rots	1st and 2nd inspection	None	None	3 plants per hectare
***Re-growth of plants after haulms cut/destruction	4th inspection	0.5%	0.5%	0.5%

* Of the two inspections, the higher virus percentage will be considered for the purpose of the specified limit of tolerance.

** The presence of brown rot infected plants within the specified limits of tolerance shall be permitted in the areas known to be infected with this disease. In case of plants suspected to be infected with brown rot, the neighbouring plants, one on the either side also are to be rogued out along with tubers.

*** Standards for re-growth after destruction of haulms shall be met at 4th inspection to be conducted about 10 days after haulms cutting.

Note:

• All off-types and diseased plant should be rogued out along with the tubers and destroyed.

• Gaps in the seed plot should not be more than 10.0%

•  Haulms must be destroyed as close to the ground as possible before the date specified by the certification agency. Failure to destroy haulms in time shall render the crop liable for rejection.