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

Sash_3156@yahoo.co.in

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