File:Memoirs Entomological series (1907) (14776781924).jpg

Identifier: n10memoirsentomo07impeuoft (find matches)
Title: Memoirs ... Entomological series
Year: 1907 (1900s)
Authors: Imperial Agricultural Research Institute, Delhi India. Agriculture, Department of. Memoirs ..
Subjects:
Publisher: Calcutta
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: msn

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
that raiyals fields in other parts of the district would be more badly affected. The plants germinated well, but later on in the season did not flourishand very few bolls were set compared with what might be considered a goodaverage field—many of the plots giving a very uneven yield, the highestnumber of bolls gathered from any block being only 862 for the season and 1,412 for the kar or summer picking. Plate XVI, fig. 2 gives the degreeof infestation week by week and also the increase in boll-worm population.For the purpose of calculating the latter only actual boll-worms found werecounted, and reduced to terms of jwpulation per 100 bolls. Plate XVII, fig. 1gives the same calculations from 1919-20 season. The most striking featurenoticed, when comparing the two charts, is that whereas last year, towardsthe end of the season, i.e., after 8-VII-20, the percentage of population wasfar higher than the amount of infestation, in this year this was not nearly 1 Ballard, E. ibid. PLATE XVI
Text Appearing After Image:
; «* z c: *** < ,** k * • -* 2 j l/» *\ V £ t h c i , / 5 z c * 2 w i . / u* u a i ^y ^ * 0 C0 r*» ** S, s c< o o d 2^5 Hi / 5 J 5 tr ~ 3C ^ j5 ;*g c 2^ p_a ^ 3 r - 1 £ z ? »J Z z ?* tt, 0 •** / z - •-. . • ff> o O 2 )< H& t hh 0 0 ft a •*- — Si ill I/) -, 1 .mm > 5o 8 4 5 ^m i- — >* p - HI I CO E. BALLARD ! 7:; so marked, the population keeping about the same figure as the boll infestation.It is higher during the interval between first and second crops and rises againat the end of second crop, just before plants were pulled up. The infestationfor the same week (second week in July) in the two years is the same. Table I. Number of bolls set by idiots oj 100 plants ami degree oj infestation. ll-XII-20—23-VII-21. No. ofplot No. of Actual green Infestation population Date Remarks bolk Platyedra (Percentage.) 1 35n10memoirsentomo07impeuoft

Note About Images