18- 



of this predator to develop and/or deposit eggs. At the end of 

 the two-week test period, not even a single predator mite regained 

 reproductive capability. Therefore, we do not recommend use of 

 Benlate after the first cover spray, when A^ fallacis are entering 

 the trees. Leaf residues of Zolone 3EC killed all A. fallacis , 

 thus preventing successful completion of this test. 



TABLE 3. INFLUENCE OF PESTICIDE RESIDUES 

 REPRODUCTIVE CAPABILITY. 



ON Mblyseius fallacis 



PESTICIDE* 



AVERAGE NO. EGGS/A. fallacis FEMALE** 



TREATED LEAVES 



CHECK LEAVES 



Imidan (phosmet) 50WP 17.5 



Guthion (azinphosmethyl) 50WP 21.6 



Zolone (phosalone) 3EC dead 



Benlate (benomyl) 50WP 



Cyprex (dodine) 65WP 21.0 



Captan 50WP 21.0 



Glyodin 30%EC 19.8 



20.7 

 19.1 

 23.4 

 22.6 

 22.2 

 20,4 

 21.5 



* Applied at recommended orchard rate (see Table 1). 

 ** 14-day egg totals. 



Conclusions 



The laboratory data presented here thus support our sugges- 

 tions based on earlier field studies that certain orchard spray 

 materials are harmful in different ways to populations of A. 

 fallacis . For example, combined field and laboratory resuITs 

 clearly demonstrate that the directly toxic effects of Zolone 

 (both EC and WP) and Sevin, and the indirectly toxic (antirepro- 

 ductive) effects of Benlate can have serious consequences to 

 to populations of A_^ fallacis , thus creating spider mite outbreaks 

 Care should therefore be taken when deciding which orchard spray 

 materials to use for sound pest management. In the future, we 

 will continue our field and laboratory testing of the influence 

 of orchard spray materials on population buildup of our principal 

 mite predator, Amblyseius fallacis , in our apple orchards. 



**************** 



NOTICE: THE USER OF THIS INFORMATION ASSUMES ALL RISKS FOR PERSONAL 

 INJURY OR PROPERTY DAMAGE. 



WARNING: PESTICIDES ARE POISONOUS. READ AND FOLLOW ALL DIRECTIONS 

 AND SAFETY PRECAUTIONS ON LABELS. HANDLE CAREFULLY AND STORE IN 

 ORIGINAL LABELED CONTAINERS OUT OF REACH OF CHILDREN, PETS AND LIVE- 

 STOCK. DISPOSE OF EMPTY CONTAINERS RIGHT AWAY, IN A SAFE MANNER 

 AND PLACE. DO NOT CONTAMINATE FORAGE, STREAMS AND PONDS. 



