THE MELON FLY. 



21 



cooler weather upon the activities of the fly. 

 tomato are subject to attack. 



Only the fruits of the 



STRING BEANS. 



The ordinary varieties of string beans grown on the mainland as 

 a rule are not infested by the melon fly. Of the variety commonly 

 known as the Yellow Wax bean, 375 pods sufficiently ripe to have 

 turned color were ex- 

 amined at Haleiwa and 

 were found free from 

 attack, although grow- 

 ing close to a field of 

 badly infested pump- 

 kins, in March. Exami- 

 nations of string beans 

 in other localities, par- 

 ticularly about Hono- 

 lulu, indicate that 

 seldom are any of the 

 varieties infested ex- 

 cept the more fleshy, 

 long-podded Chinese 

 variety. This variety 

 may be attacked very 

 badly when grown 

 near other favored 

 host fruits or on land 

 recently cleared of 

 such crops, as illus- 

 trated by figure 22. As 

 many as 36 well-grown 

 larvae have been found 

 within a single pod. 



. Although the Chi- 

 nese variety is the only 

 one at times generally 

 and badly affected, 

 beans of all varieties 

 except the Lima bean should be included in quarantine lists. The 

 Lima bean never has been found infested. Only the pods of beans 

 usually are infested. The larvae prefer to feed upon the fleshy por- 

 tions of the pod, but sometimes attack the seeds. In badly infested 

 pods, attacked before the seeds are well grown, the larvae may eat out 

 the seeds and leave nothing but the outer portion untouched. This 

 also is true of cowpeas. 



Fig. 20. — Deformed watermelon resulting from late in- 

 festation by larvas of melon fly. (Authors' illustra- 

 tion.) 



