priciples of insecticide use in rice ipm
priciples of insecticide use in rice ipm
priciples of insecticide use in rice ipm
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Insecticides <strong>in</strong> Rice IPM (DRR)<br />
Table 17 : Effect <strong>of</strong> neem bitters (neem seed kernel water extract) on nymphal survival<br />
<strong>of</strong> brown planthopper (BPH) and green leafhoppers (GLH)<br />
Neem bitters<br />
concentration (ppm)<br />
100 95a 80a 65b 58b<br />
500 83ab 42b 20c 0c<br />
2,500 40c 0c 0d 0c<br />
5,000 1d 0c 0d 0c<br />
10,000 0d 0c 0d 0c<br />
0 (Control) 84ab 87a 84a 68a<br />
EFFECT OF RICIN FROM CASTOR<br />
Kwon et. al. (1991) from Korea republic observed high <strong>in</strong>secticidal activity <strong>of</strong> ric<strong>in</strong> (a compound isolated<br />
from castor leaves and identified as 1,2-dihydro-4-methyl-2-oxo-3-pyrid<strong>in</strong>e carbonitrile) to BPH.<br />
92<br />
Brown planthoppers Green leafhoppers<br />
Spray Root dip Spray Root dip<br />
Figures <strong>in</strong> a column followed by common letter are not significantly different at P = 0.05;<br />
(Krishnaiah and Kalode, 1988b)<br />
Table 18 : Relative Efficacy <strong>of</strong> neem formulations aga<strong>in</strong>st BPH<br />
Neem formulations LC 50 (% Conc.)<br />
Azadiracht<strong>in</strong> Conc.<br />
(ppm) <strong>in</strong> formulation<br />
LC 50 as Conc. Of<br />
Azadiracht<strong>in</strong> (ppm)<br />
Nimbecid<strong>in</strong>e* 1.695 300 5.09<br />
Neem Azal T/S 0.962 10000 96.16<br />
Econeem 2.114 3000 63.42<br />
Neemgold 4* 0.529 300 1.59<br />
Fortune Aza 0.973 1500 14.59<br />
Rakshak 1.454 1500 21.81<br />
Achook* 1.317 300 3.95<br />
Neemax* 0.854 300 2.56<br />
* oil based neem formulations<br />
(Krishnaiah, 2000)
Change language