Guapsin — this is a bio-preparation containing bacteria Pseudomonas aureofaciens B-111 and B-306. The preparation contains 10*10 micrograms of viable cells. The preparation is used in agriculture for plant protection. It is applied to cereal crops and fruit trees, such as apple trees. The preparation can also be used for retail sale to the public. Guapsin is a solution that is convenient to apply and meets modern ecological safety requirements.