A second study showed that the ability of All strain S. carpocapsae to enter mines and kill larval miners was dependent on the relative humidity during the 48 hours following treatment. In greenhouse conditions under ambient relative humidity (50-91%) mortality ranged from 24-43%. In a fog house, with a relative humidity of >92%, mortality of leafminers was >65%. A comparison of nematode species and strains in the laboratory found both highly virulent and less virulent strains. Field tests in a fog house found the All strain of S. carpocapsae and a Hawaiian isolate of S. feltiae (MG-14) were superior to other isolates.
Le Beck, L. M., R. Gaugler, H. K. Kaya, A. H. Hara, and M. W. Johnson. 1993. Host stage suitability of
the leafminer Liriomyza trifolii (Diptera: Agromyzidae) to the entomopathogenic nematode Steinernema
carpocapsae (Rhabditida: Steiner-nematidae). J. Invert. Pathol. 62: 58-63.
Hara, A. H., H. K. Kaya, R. Gaugler, L. M. Le Beck, and C. L. Mello 1993. Entomopathogenic nematodes for biological control of the leafminer, Liriomyza trifolii (Diptera: Agro-myzidae) Entomophaga 38: 359-369.