Control of Potato Tuber worms with Phosphamidon in Southern California1

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Abstract
Phosphamidon at dosages of 0.5 to 1.0 lb./acre provided control of the potato tuberworm, Phthorimaea operculella (Zeller), that was comparable to that given by the standard treatment: azinphosmethyl at 0.75 lb./acre. Di-methoate at 1.0 lb. provided fair control. The following materials did not give effective potato tuberworm control: endrin at 0.75 lb./acre, and diazinon, endosulfan, Azodrin (3-hydroxy-N-methyl-cis-crotonamide dimethyl phosphate), Matacil (4-(dimethylamino)-m-tolyl methyl-carbamate), SD 8447 (2-chloro-l-(2,4,5-trichlorophenyl)vinyl dimethyl phosphate), Bay 25141 (0,0-diethyl o-fp-(methylsulfinyl)phenyl] phos-phorothioate), and NTA 10242 (2,3-dihydro-2,2-dimethyl-7-benzo-furanyl methylcarbamate) at 1.0 lb./acre.

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