PEAR AND QUINCE INSECTS 221 



Many of the eggs and newly hatched nymphs can be destroyed 

 by spraying with hme-sulfur at the strength used for scale, 

 making the application when the blossom cluster-buds are 

 })eginning to separate at the tips. 



By the time the petals have fallen, nearly all of the eggs have 

 hatched and the young nymphs are clustered at the base of the 

 leaf petioles and the fruit stems, where they may be easily 

 killed by thorough spraying with kerosene emulsion, diluted 

 with 10 parts of water, whale-oil soap, 1 pound in 4 to G gallons 

 of water, or " Black Leaf 40 " tobacco extract, f pint in 100 

 gallons of water, adding 3 to 5 pounds of soap. As the nymphs 

 grow older they become more difficult to kill and the expanding 

 foliage gives them more protection from the spray. To get 

 the best results the first application should be made just after 

 the petals fall and should be repeated in three or four days. 

 By thoroughly killing off the first brood at this time complete 

 protection of the crop for the entire season can be obtained. 

 It has never been found practicable to kill the summer adults ; 

 they are very active and take flight at the slightest alarm. 



References 



Cornell Agr. Exp. Sta. Bull. 44. 1892. 



Cornell Agr. Exp. Sta. Bull. 108, pp. 69-81. 1896. 



N. Y. (Geneva) Agr. Exp. Sta. Giro. 20. 1913. 



False Tarnished Plant-bug 



Lygus invitus Say 



This close relative of the tarnished plant-bug has for many 

 years caused considerable loss to the pear growers of western 

 New York. In certain orchards half of the crop has been ren- 

 dered unsalable by the punctures of this obscure insect. Pears 

 that have been injured in this way are knotty, deformed and 

 gritty in texture (Fig. 203). 



