Mite Populat 

 (ERM) peak a 

 (TSM) did no 

 mites (ARM) 

 bers in IPM 

 unless in ex 

 source for o 

 and TSM prey 

 of chemicals 

 peak number 



ions. Overall, I 



nd average number 

 t exceed very low 

 were found in sub 

 blocks (Table 2). 

 cess of 300 per 1 

 ur major mite pre 

 are few in numbe 

 toxic to AF prob 

 of AF in IPM than 



-12- 



PM blocks had lower European red mite 

 s than the check. Two-spotted mites 



levels in any block, while apple rust 

 stantial (but well below damaging)num- 



ARM cause no damage to fruit trees 

 eaf and may serve as an alternate food 

 dator Ambylseius fallacis (AF) when ERM 

 r. Higher ARM populations and avoidance 

 ably account for higher average and 



check blocks. 



Table 2. Average and peak number of mites per leaf (IPM and check 

 orchards) in relation to acaricide sprays, 1979. 



Acaricide 

 dosage 



Number of mites per leaf 



European Two -spotted Apple Amblyseius 

 Orchard No . Avg . no . equivalents^ red mites mites rust mites fallacis 

 type Blocks spray dates Oil Other Avg! Peak Avg. Peak Avg. Peak Avg. Peak 



IPM 

 Check 



15' 

 9 



0.6 

 1.1 



1.06 0.4 1.2 4.0 0.3 0.8 34.5 69.3 0.03 0.11 

 1.04 1.7 2.3 10.0 0.3 0.6 8.3 19.1 trace 0.01 



block not included (grower did not comply with IPM recommendations) 



One 



^p. • -1 „^ _ actual pesticide rate/100 gal. 



" ^ NY recommended pesticide rate/100 gal. 



In keeping with program objectives, IPM growers have generally 

 avoided the use of materials which are known to be harmful to bene- 

 ficial predators and parasites [ Fruit Notes 43(5)] . The recent ad- 

 vent of spotted tentiform leafminer (STEM) as a major pest 

 chusetts and use of the carbamate insecticide, Lannate*, 

 STEM posed a serious threat to IPM objectives. 



in Massa- 

 to control 



In one Granville area orchard this season, high counts of second 

 generation STEM mines indicated a need to treat for this pest using 

 Lannate*. For the remainder of the season there was a sharp decline 

 in numbers of Amblyseius fallacis (AF) . The possibility exists that 

 AF may survive in the ground cover if spray runoff is not excessive, 

 although this remains to be proven. 



Trade name 



