BULLETIN" 643, U. S. DEPARTMENT OF AGRICULTURE. 



other vegetables to-day can not be grown in many parts of the islands 

 except with great effort ; they must be imported from across the sea, 

 as a result of melon-fly attack. 



The melon fly is capable of living and causing damage through- 

 out the warmer portions of the mainland United States. As it is 



Fig. 1. — Tip of watermelon vine, showing adult melon fly laying eggs in ovary of a flower 

 still in bud, an iraaffected male bloom, and withered and drooping growing tip of vine. 

 A female melon fly has deposited eggs in the vine at base of leafstalk, and the young 

 larvse hatching have nearly severed the vine at this point. (Authors' illustration.) 



being intercepted rather frequently by official inspectors at Cali- 

 fornia ports on ships from Hawaii, the importance of cooperation by 

 all in making the quarantine of the Federal Horticultural Board a 

 success in keeping out this very serious pest will be readily appre- 

 ciated. 



