MAINE AGRICULTURAL EXPERIMENT STATION. 19 



A band of eggs encircling a twig. 



I. Egg mass with rounded ends. (fig. 36). 



Orchard tent-caterpillar eggs. Page 48. 

 II. With square ends. 



Forest tent-caterpillar eggs. Page 35. 

 Eggs adhering to a grayish cocoon ; cocoon enclosing a 

 brownish empty pupal skin. (fig. 39). 



Antique tussock. Page S3- 

 A whitish frothy mass enclosing several layers of eggs adher- 

 ing to a grayish cocoon, with empty pupal skin within. 



White-marked tussock. Page 33. 



Microscopic creatures causing reddish spots on the leaves more or 



less blister-like beneath. Blister mite. Page 53. 



a. PLANTLICE. 



Besides the woolly aphid which does its chief damage to the 

 apple roots, several species of aphids attack the leaves, fruit 

 and tender stems. These are minute insects about J of an inch 

 long. They pierce the tissue of the shoots with their beaks 

 and suck the sap or infest the leaves causing them to curl, or 

 become sickly. When they attack the growing fruit the apples 

 are dwarfed and puckered, and often rendered unmarketable. 

 Some species of these pass their whole life upon the apple while 

 others spend part of the year on other plants. But as all the 

 important species return to the apple twigs to lay eggs in the 

 fall and as they resemble one another closely, both in appear- 

 ance and manner of injury, it is not necessary to discuss more 

 than two species here. 



Aphids are frequently attended by ants which are attracted 

 by honey dew, a sweet secretion of the aphids, and the presence 

 of ants about the apple leaves is a pretty certain sign of aphid 

 infestation. 



Lady beetles (figs. 52, 53) both in the adult and larval stage 

 feed greedily upon aphids and should not be mistaken for inju- 

 rious insects. Syrphus maggots also are among the most bene- 

 ficial insects in the State in this respect, as they destroy aphids 

 in great numbers. 



