Effect of abiotic factors with productivity link parameters of lac insect, Kerria manipurensis in Manipur

 The  study  reveals  that  the  initial  density  of  settlement  of  showed a positive  correlation (r=  +0.85)  with  morning  relative  humidity  whereas  it  was  negatively  correlation  with  evening humidity  (r=  -0.22),  maximum  temperature  (r=-0.80)  minimum  temperature  (r=-0.77)  and  rainfall (t=-0.33),  respectively.  High  male  percentages  91.63%,  86.54%  and  84.77%  were  observed  on  all  the 4  months  crop  of  existing  species  of  lac  insect  in  Imphal  west  district  under  field  condition  during 
2017  to  2019  as  against  22.50%,  19.65%  and  17.64%  on  8  months  crop  during  2017  to  2020. Correlation  analysis  showed  a  positive  correlation  of  sex  ratio  (male  %)  with  both  maximum  and minimum  temperature,  evening  humidity  and  rainfall  with  r  values  of  0.86,  0.95,  0.39  and  0.60, respectively  indicating  high  response  of  weather  parameters  on  the  male  percentage  of  lac  insect. Fecundity  of lac  insect  showed  a positive  correlation  of = +0.62  indicating  great  influence  of morning relative  humidity  as  against  other  weather  parameters  ie.  maximum  temperature,  minimum temperature,  evening  relative  humidity  and  rainfall  which  showed  negative  correlation.