Jan. , 923 Inoculation Mechanics with Mosaic by Insect Vectors 
283 
^ f l 116 1 ,f afho PP ers ’ Peregrinus maidis and Draeculacephala 
2“’ d ° not ! adicate that the phloem is especially sought during 
teedmg The evidence points more to the tracheae as the obiect of 
. but J? the case of D. mollipes it is impossible to determine this 
point, since the relatively enormous setae are as great in diameter as the 
f eadre ^tdar bundles found in the young leaves where they prefer to 
of D J!^ mg 1 efi r te be s , t£ded . in re « ard t0 the feeding phenomena 
™° lh P e f which would exclude it as a possible carrier. All cells in 
the path of the setae, however, are crushed or engulfed in their entirety, 
t here is some evidence of salivary excretion even in this large leafhopoer 
since a few traces of the brilliant red can be seen along the course of the’ 
puncture, but no definite sheath could be demonstrated. It would appear 
quite possible for this insect to penetrate to the vascular bundkTby 
mechanical pressure alone instead of by the digesting or dissolving action 
? f A a wbmh is quite necessary to account for the penetration of setae 
a J;. h f s< ; studie f, f e b ?hig continued with virulent as well as nonvirulent 
thttLui Para ”f f nes “ the hope that more light may be thrown on 
this problem and also on the etiology of the disease. 
LITERATURE CITED 
(1) Brandes, E. W. 
1920. ARTIFICIAL AND INSECT TRANSMISSION OF SUGAR-CANE -MOSAIC. In 
(2) Bruner, s/c^' Agf ' Research ’ v ' x 9 - P- 131-138- Literature cited, p. 138. 
1922 . SOBRE LA TRANSMISION DE LA ENFERMEDAD DEL “MOSAICO” O “RAYAS 
amarillas En la cana de azucar. In Rev. Agr. Com. y Trab 
/ \ -D •• ™ L Cuba ]» V. 5 , no. I, p. 11-22, 5 fig. * 
(3) Busgen, M. j 6 
1891. DER honigtau. In Jen. Ztschr. Naturw., Bd. 25 (n. f. Bd. 18), d 220- 
428, pi. 15-16. n ooy 
(4) Chardon, Carlos E., and Veve, Rafael A. 
I922. SOBRE LA TRANSMISI6N DEL MATIZADO DE LA CA*A FOR MEDIO DE 
(5) ICunkel, L. O ev - Agr - Puert0 Rlco ’ v - 9 - no - 2 - P- 9-20, 2 fig. 
1922. insect transmission op yellow stripe disease. In Hawaii. Planters' 
(6) Ledeboer, F. C " 26 ’ P ' 58_64 ’ iUuSl literature cited, p. 64. 
1921. gelestrepenziekte. In Arch. Suikerindus. Nederland.-Indie, Taarg 
29, p. 1000-1001. ’ J 
(7) - 
1922. ZIEKTEN en plagen. In Verslag Onderafdeeling Cheribon, Proefst 
^ Java-Suikerindus., 1921, p. 12-16. 
(8) Smyth, I£. Graywood. 
1919- insects and mottling disease. In Jour. Dept. Agr. Porto Rico v 2 
. . no. 4, p. 83-116. ° , v. s, 
(9) - 
1920. insect transmission OF cane mottling disease. In Ann. Rpt. Insular 
Exp. Sta. Porto Rico, 1919-20, p. 83-83. 
(10) Tower, W. V. F J 5 
1920. MOTTLING DISEASE of SUGAR cane. In Rpt. Porto Rico Agr. Exp. Sta. 
1919, p. 21-25. 
(11) Wolcott, George N. 
(12) 
1921. the minor sugar-cane insects of porto Rico. Tour. Dent Aer Porto 
Rico, v. 5, no. 2, 46 p., 19 fig. J p- s- 
1922. ANNUAL REPORT OF THE DIVISION OF ENTOMOLOGY. In Ann. Rot 
Insular Exp. Sta. Porto Rico, 1920—21, p. 47—49. 
