Integrated Management of Insect-Induced Reddening in Bt Cotton Hybrids 281
References
Dastur RH, Singh K, Kanwar SR (1952) Investigations on
the red leaf in American cottons in Malwa and Bom-
bay Karnataka. Indian Cotton Grow Rev 6:193–204
Dhopte AM (2001) Leaf reddening in cotton: impact, causes
and remedies. Kalyani Publishers, New Delhi, p 217
Ghante VN, Ranjithkumar L, Chowdary Rajesh (2010)
Management of leaf reddening in Indian Bt cotton
needs a multidisciplinary approach. Green Farming
1(6):668
Khadi BM (2007) Impact of Bt-cotton on agriculture in
India. http://www.gmo-safety.eu/pdf/biosafenet/Khadi.pdf.
Accessed 27 Oct 2013
Koukal J, Conn BE (1961) Metabolism of aromatic com-
pounds in higher plants. J Biol Chem 236:2692–2698
Naidu TCM, Mahalakshmi BK (2011) Reddening of Bt
cotton under waterlogged conditions. J Cotton Res
Dev 25(1):71–73
Patil SS, Manjula M, Alkuddsi YA, Patil BC, Rajeev S,
Swathi P, Ranganath HM(2010) Mismatch in source
and sink as a reason determining realized potentialityTable 2 Screening of Bt cotton hybrids against leaf reddening
Bt hybrids Reddening severity RLI Leafhoppers/plant
90 DAS 100 DAS
RCH-530 High 2.78 3.23 6.74
RCH-2 High 3.24 3.54 7.23
MRC 7351 Low 0.98 1.02 1.86
MRC 7347 Low 0.97 1.02 1.82
Marvel Low 0.87 0.99 1.97
Brahma High 2.87 3.23 5.23
Arya High 3.24 3.89 4.85
Bunny High 3.21 3.78 5.64
Jackpot Very low 0.65 0.87 1.12
Ankur Medium 1.98 2.24 2.25
Tulsi-144 Medium 1.65 2.10 2.46
VICH-303 Medium 1.58 2.12 2.38
DCH-32 High 2.67 3.46 7.88
Pratika Medium 1.34 2.34 2.57
Table 3 Evaluation of different nutrient products on the incidence of reddening in Bt cotton
Treatment Reddening severity (RLI) Average LH/plant Yield/ha (qtl)
90 DAS 100 DAS
Multinutrient mix 0.87 1.00 3.29 24.67
MgSO4 1.17 1.63 3.45 23.66
19:19:19 1.20 2.02 2.98 23.72
KNO3 1.19 1.66 3.49 23.69
Control 2.96 3.83 13.27 14.54
Sem 0.07 0.16 0.05 0.12
CD 0.20 0.50 0.16 0.35
Table 4 Red leaf index (RLI) and economics of different modules for management of reddening in Bt cotton
Modules RLI Average Yield (qtl/
ha)
Net Return
60 DAS 100 DAS
Integrated module 0.67 1.12 26.50 76450
FP 1.78 2.89 21.40 56717
SEM 0.17 0.40 0.94 3906.6
CD 0.48 1.18 2.84 11720