August, '21] 



GARMAX: EUROPEAX RED MITE 



357 



in several selected Baldwin trees, 19-24% of the fruit was 2% inches 

 in diameter (the remaining 76-81% being smaller) while in uninjured 

 trees of the same age in the same neighborhood, 44-60% of the fruit 

 attained this size. One tree observed the latter part of September had 

 hardly any fruit fit to sell. 



Figure 7. Structures of European red mite Paratetranychus pilosus Can. 

 and Fanz. and common red spider Tetranychtis bimaculatus Harvey. 



1, Paratetranychus pilosus, seta of dorsum 846 times enlarged; 2, egg, 

 14 times enlarged; 3, collar trachea and mandibular plate, 714 times en- 

 larged; 4, tarsus of first pair of legs of female, 921 times enlarged; 5, pe- 

 nis, 1400 times enlarged. 



6, Tetranychus bimaculatus, seta of dorsum, 846 times enlarged; 7, egg, 

 14 times enlarged; 8, collar trachea and mandibular plate, 714 times en- 

 larged; 9, tarsus of first pair of legs of female, 921 times enlarged; 10, pe- 

 nis, 1400 times enlarged. 



Baldwins are more easily injured than other varieties, but some 

 browning was noted on Mcintosh, Hurlburt and Ben Davis. Green- 

 ing is resistant and although infested did not show the effects of the 

 infestation. 



How Long Has It Been in Connecticut? 



In order to become so widely distributed, the pest must have been 

 present in the State for some time. Mites reared from eggs obtained 

 in 1919 appear to be the same species as those obtained later. In look- 

 ing over otu- slide collection, a single slide was foimd containing mites 

 from apple leaves, collected by Mr. Zappe at Clintonville, a point near 



