Liyanage, Hemachandra D.(University of Ruhuna, 1987)
Resistance of Brown Plant Hopper (BPH) Nilaparvata lugens to Carbofuran was studied in the laboratory by comparing LC50 values observed for B.P.H . from five rice growing districts o f Sri Lanka. Highest LCs0 value (0.000666 ...
The introduction of the Universal Suffrage and the Executive Committee
system and the abolition of communal representations on the recommendations of the Donoughmore Commission was considered a distinct advance on
the ...
It is shown that symmetric rate equations describing the interactions between
similar species have interesting mathematical properties. The biological implications of their solutions are discussed.