Screening and selection of adjuvants for the spray application of entomopathogenic nematodes against a foliar pest
1998
Mason, J.M. | Matthews, G.A. | Wright, D.J.
The effects of adding a number of adjuvants to sprays containing infective juveniles (IJS) of Heterorhabditis n.sp. and Steinernema sp. (M87:45) was examined. The adjuvants were not directly toxic to IJS of either nematode species or to larvae of the diamondback moth, Plutella xylostella. However, infectivity of the IJS to larvae of the wax-moth, Galleria mellonella, in terms of mortality and intensity of infection, was affected by the addition of the adjuvants, compared with IJS in water alone. Deposition studies showed that the proportion of droplets carrying IJS was not affected by the addition of the adjuvants following application with spinning disc sprayers (Micron Ulva+ and Micron Herbaflex). However, addition of the adjuvants resulted in a significant increase in deposition, in terms of the mean numbers of IJS per cm2. This was noted following application with both sprayers and for both nematode species. The spray spectra produced by either sprayer was generally not affected much by the addition of any of the adjuvants to the spray solutions.
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