Abstract: The anti-antihemocytic serum comprises water-soluble proteins in a physiological solution isolated from cells of the bodies of insects immunized by a single injection in a dose of 0.25 .mu.l to 2.0 .mu.l for every insect with the anti-hemocytic serum produced from the plasma of the blood of an animal immunized with a suspension of hemocytes from cells of the bodies of the given species of insects. The titre of hemocytoagglutinins of the anti-antihemocytic serum is 1:256 to 1:1024. The method for the preparation of anti-antihemocytic serum resides in immunizing the given species of insects with antihemocytic serum, produced from the plasma of the blood of an animal immunized with a suspension of hemocytes from cells of the bodies of insects, by means of a single injection in a dose of 0.25 to 2.0 .mu.

Abstract: The anti-hemocytic serum for suppressing the immunologic mechanism of insects which is inactivated blood plasma of immunized animals produced by immunization of animals with a hemocyte suspension separated from cells of the bodies of insects; the titre of hemocytoagglutinins of the anti-hemocytic serum is 1:256 to 1:2048. The method for the preparation of the anti-hemocytic serum resides in removing the alimentary tract from insects and the hemolymph, preserving the remaining cells of the bodies of insects and homogenizing them to form a hemocyte suspension, washing off the preservative from the suspension before immunization and immunizing animals 4 times with intervals of 5 days, injecting a 50% hemocyte suspension in an amount of 0.07 ml per 100 g of the weight of the animal, isolating the blood plasma of animals after immunization and inactivating it.