SCREENING OF EARLY AND MEDIUM/LATE MATURING SUGARCANE …
Transcript of SCREENING OF EARLY AND MEDIUM/LATE MATURING SUGARCANE …
SCREENING OF EARLY AND MEDIUM/LATE MATURING
SUGARCANE VARIETIES/LINES AGAINST BORERS
SHASHI BHUSHAN.V, SURESH.K AND
VIJAY KUMAR.M
Agricultural Research Station
Basanthpur Medak district
AP, India
The normal area under sugarcane in this region is
54,974 ha
about 25% of total cane area in the state. presently
50,000 ha primarily in Medak and adjoining
districts like Nizamabad and Khammam
The varieties popularly grown in this region are
Early group
83 R 23
Co c 671,
Co 8014,
87 A 298,
86 V 96
Mid late group
85 R 186
Co 86032,
Co 87025,
Co 7219
Co 7805
Pupa and adult stage of ESB, C. infuscatellus
Male pupae Female pupae Female adult Male adult
Egg stage of ESB, C. infuscatellus
Freshly laid eggs on ventral side of the leaf near the mid rib
Eggs after 24 hours
Five larval instars of ESB, C. infuscatellus
3rd instar
1st instar 4th instar 5th instar
2nd instar
Deadheart formed by ESB, C.infuscatellus
EARLY SHOOT BORER (Chilo infuscatellus Snellen)
Shoot borer at Early
stage &
Internode borer after
internode formation
Dead Heart Symptom
Dead Heart
Grownup larva inside the deadheart
Grownup larva of ESB, C. infuscatellus inside the deadheart and hole made by
5th instar larva before pupation
Hole made by 5th instar larva before pupation
INTERNODE BORER
• From internode formation
till harvest
• Larvae bore into the
internodes and the frass
is pushed out to the
exterior
• Damaged internodes get
hardened and crushing
becomes difficult
Presence of dead heart
formed of leaf spindle
and top two leaves.
Dead heart can be
pulled out with a little
force.
Presence of one or two
holes in the top portion
of stem.
Internode borer
Cane stage
Damage restricted to a particular internode,
preferably third to fifth form the top.
Damaged internodes show small borer hole
extending either side making semi-circle.
Fresh, deep yellowish granular frass oozing
out through borer holes.
Severe infestation of Early shoot borer
Larvae of ESB
The crop was planted in winter season
with spacing of 1.20 meter distance among rows.
The plot size of each experimental unit was 4.8 x 5
meter comprising four rows.
Two central rows were selected from each plot for
recording observations on borer infestation percentage
on dead-heart basis. Healthy and infested tillers of
central two rows were counted separately during August
and borer infestation percentage on dead-hearts basis
caused by ESB and internode borers was calculated
For recording borer infestation percentage on internode damage
basis, ten canes were randomly collected from each unit at
harvesting time and canes were splitted longitudinally and closely
examined.
Number of total internodes and infested internodes were counted
separately from each cane and borer infestation percentage on
internode damage basis was calculated
Sugarcane genotypes were categorized in different degree of
resistance/susceptibility according to resistance scale described
by Jena et al. (7).
SNo Variety
Early
1 93 A 11
2 92 A 62
3 92 R 62
4 94 R 247
5 83 R 23
6 Co 8014
7 Co 6907
8 Co C 671
9 Co C 92061
10 87 A 298
11 89 V 96
12 83 A 30
13 Co 94008
14 86 v 96
15 94 A 124
SNo Variety
Mid Late
1 98 R 157
2 98 R 67
3 97 R 129
4 94 R 247
5 97 R 383
6 Co 87025
7 Co 86032
8 85 R 186
9 97 R 401
10 Co 99006
11 Co 99004
12 Co 94012
13 Co 62175
SCREENING OF EARLY AND MEDIUM/LATE MATURING
SUGARCANE VARIETIES/LINES AGAINST BORERS
on dead heart basis
• No. of entries tested
• Early maturing varieties
• Late maturing varieties
• No.of entries Least
suceptible (LS/or
Tolerant)for ESB
• Moderately Resistant
• susceptible
• 28
• 15
• 13
• 16
• 6
• 6
Degree of resistance to the borers
on dead-heart basis
0
2
4
6
8
10
12
14
16
Var
SCREENING OF EARLY AND MEDIUM/LATE MATURING
SUGARCANE VARIETIES/LINES AGAINST BORERS
on inter node damage basis
• No. of entries tested • Early maturing varieties
• Late maturing varieties
• No.of entries Least suceptible (LS/or Tolerant)
• Moderately Resistant
• susceptible
• 28
• 15
• 13
• 19
• 8
• 1
Degree of resistance to the borers
on inter-node damage basis
0
2
4
6
8
10
12
14
16
18
20
Var
Average Dead heart percentage in early and
medium/late maturing sugarcane varieties
• Early varieties
2.96-5.19
• Medium and late
varieties
3.30- 8.43
Average borer infestation in Early maturing varieties
on dead heart basis and inter-node damage basis
0
0.01
0.02
0.03
0.04
0.05
1 2
% d
am
ag
e
• Early maturing varieties 15
• AV.borer infestation on Dead
heart basis 4.27 %
• AV.borer infestation on
internode damage basis
4.46%
• Medium and late maturing
varieties 13
• AV.borer infestation on Dead
heart basis 5.58
• AV.borer infestation on
internode damage basis
5.98
Average borer infestation in Medium/late maturing
varieties on dead heart basis and inter-node damage
basis
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
1 2
% d
am
ag
e