ENCLOSURE TO PART 1V. 
6 Is there any experience on a practical scale elsewhere than in 
the West Indies, indicating clearly that control of Dysdercus 
suffices for the control of internal boll diseases? 
i Is there any experience to the contrary? 
R Have any of the delegates any experience of serious shedding 
of young bolls in the field clearly attributable to invasion by 
Dysdercus ? 
Have such troubles as irregular development of lint in the 
bolls and failure of the latter to open normally been noted as 
of serious importance in the field? If so, have these troubles 
been traced definitely to the agency of Dysdercus? 
10. Has Dysdercus been associated anywhere with injury to 
cotton seed on such a scale as seriously to affect the quantity 
of suitable seed available for sowing, and to render a large 
proportion of the seed useless for crushing? 
The CHAIRMAN (Mr. Fuller) stated that he was in considerable 
sympathy with the paper, as he thought that Dysdercus got the blame 
for staining, for which it was not responsible. 
Mr. HAINES (contributed). In South Alrica it is questionable 
how much lint-staining is caused by Dysdercus spp. We are more 
concerned, at present, in the part Dysdercus plays in the spreading of 
plant diseases, especially boll-rots. Since our attention has been 
given mainly to a study of the boll worms, we have little definite 
information in regard to stainers. Stainers fluctuate in abundance 
from year to year, and are rarely abundant until late in the season. 
A few years ago Dysdercus superstitiosus was common, but now 
Dysdercus nigrofasciatus and Dysdercus fasciatus appear to be the 
more common species. There appears to be considerable lint-staining 
due to infections following bollworm attacks. 
After discussion it was agreed : 
*That the status of suctorial insects in the spread of boll-rot 
requires much more investigation before any definite statements 
can be made. The problem is the more difficult, owing to the 
fact that the boll-rots have not yet been classified. 
* Subsequently amended. See pages 172 and 178. 
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