22 



PLANT-BUGS INJURIOUS TO COTTON BOLLS. 



insects had been abundant, and the results of the examination are 

 summarized in the following table : 



Table III. — Injury by plant-hugs to cotton bolls. 



BOLLS. 



Diameter. 



Number. 



Uninjured. 



Slightly injured. 



1-1 



Inches. 



15 

 10 



°! 







l>2 



1-1| 



Total 



25 



2 



2 





LOCKS. 



Number. 



Destroyed by 

 bugs. 



Slightly injured 

 by bugs. 



Destroyed by 

 weevils. 



Uninjured. 



60 

 40 



45 

 15 



8 

 11 



1 

 2 



6 

 12 



100 



CO 



19 



3 



18 



FEEDING PUNCTURES. 



Total. 



Number in 



destroyed 



locks. 



Number in 

 slightly in- 

 jured locks 



Niimber in 



uninjured 



locks. 



Average per 



destroyed 



lock. 



Average per 

 slightly in- 

 jured lock. 



Average per 



iminjured 



lock. 



Average per 



destroyed 



boll. 



366 

 300 



346 

 186 



20 



82 





 32 



7.7 

 12.4 



2.5 

 7.0 







2.6 



26 

 30 



666 



532 



1 102 



1 



32 



8.9 



5.3 



L8 



28 



Destroyed bolls. 



Slightly injured bolls. 



Destroyed locks. 



Slightly injured 

 locks. 



Unin- 

 jured 

 locks. 



1 



Maximum Minimum 

 number of number of 

 punctures. | punctures. 



Maximum 

 number of 

 punctures. 



Minimum 

 number of 

 punctures. 



Maxi- 

 mum 

 number 

 of punc- 

 tures. 



Mini- 

 mum 

 number 

 of punc- 

 tures. 



Maxi- 

 mum 

 number 

 of punc- 

 tures. 



Mini- 

 mum 

 number 

 of punc- 

 tures. 



Maxi- 

 mimi 

 number 

 of punc- 

 tures. 



69 

 81 



7 

 15 





20 



1 



5 



1 





55 



16 





22 





4 





16 



1 





10 



a Two locks destroyed by boll weevil larvae. 



b Including one boll with 55 feeding punctures by bugs, lint only slightly stained at time of examination. 



The data given in Table III will serve as a guide to the relation 

 between plant-bug punctures and the damage which results, as well 

 as an example of a condition which may be occasionally met with in 

 cotton fields of northern Texas where large numbers of plant-bugs 

 are concentrated in small areas. Fortunately such occurrences are 

 not common and are generally restricted to small areas where the 

 surroundings are favorable for the breeding of the bugs in large 

 numbers. 



