THE MELON FLY. 
21 
cooler weather upon the activities of the fly. Only the fruits of the 
tomato are subject to attack. 
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 larvse 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 larvse of melon fly. (Authors' illustra- 
tion.) 
