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Cyst Tech® products are mixtures or blends of seed from two or more soybean varieties.

According to the company, Cyst Tech® level A (CTA) is a blend of seed of both SCN-susceptible and SCN-resistant varieties and Cyst Tech® level B (CTB) is a blend of seed from two or more SCN-resistant soybean varieties.



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CystX® varieties are soybean varieties with single sources of SCN resistance.

CystX® SCN-resistant soybean varieties were developed by Purdue University scientists from the University of Missouri SCN-resistant soybean variety ‘Hartwig,’ which possessed SCN resistance from the soybean breeding line ‘PI 437654’ (“PI” stands for “plant introduction”).