-8- 



a habitat suitable for A. fallacis buildup. 



With these results, the list of pesticides now known to have 

 highly toxic effects (at recommended orchard rates) on Massachusetts 

 strains of A. fallacis includes Zolone (phosalone) Systox 

 (demeton) 6 EC, Sevin (carbaryl) 50 WP, Diazinon 50 WP, Lannate, 

 Cygon, Pydrin, Pounce, Carzol (formetenate hydrochloride) 92 SP, 

 Paraquat CL (paraquat). Roundup (glyphosate) and Ammate X. (Also, 

 (benomyl) 50 WP has strong anti-reproductive effects on A. fallacis ) . 

 Those known to have moderately toxic effects include Phosphamidon 

 (dimecron) 8 EC, Kelthane (dicofol) 35 WP, and Karathane. Until 

 we learn more about possible ways in which the detrimental effects 

 of these materials can be reduced, we discourage their use by orchard- 

 ists aiming at an integrated program of spider mite management except 

 where needed in emergency situations, such as San Jose scale or 

 tentiform leafminer outbreaks. 



Table 1. Toxicity of pesticides to Amblyseius fallacis (Bishop 

 strain) at recommended orchard rates . 



Material 



Rate/100 gals. Mortality, ^o Toxicity Rating 



INSECTICIDES 



Lannate [methomyl) 1.8 EC 

 Cygon (dimethoate) 2 . 7 EC 

 Pydrin (f envalarate) 2.4 EC 

 Pounce (permethrin) 3.2 EC 

 Penncap M (parathion) 2 FM 



FUNGICIDES 



Karathane (dinocap) 25 WD 



Polyram 80 WP 



Phygon XL (dichlone) 50 WP 



Manzate D 80 WP 



HERBICIDES 



Ammate X ["ammonium sulfamate) 



Dowpon M (dalapon) 



