The other factors to consider relate to their actual usage. In order to ensure maximum effectiveness, it is crucial to apply them at the optimum environmental conditions needed for their survival. Therefore, it is best to irrigate the target site, both before and after application, because they need moist conditions to prevent desiccation and aid with movement to find hosts. Also, the best results are obtained when the relative humidity is high, ambient temperature is neither extremely hot or cold, soil temperature is between 55 o and 90 o F, soil is moist and direct sunlight is minimal. All of these factors help prevent the nematodes from drying out and increase their survival.
Manufacturers There are currently eight nematode manufacturers in the United States.
Biosys produces different Steinernema species. Hydro-Gardens, Inc. , Nematec, and Praxis manufacture various Heterorhabditis species. They then sell the nematodes to consumers using various product names. Control Black Vine Weevil, Otiorhynchus sulcatus , in Potted Plants. Davidson, J.A., S.A. Gill, and M.J. Raupp.