New Horizons in Insect Science Towards Sustainable Pest Management

Inducing Resistance in Sesamum Accessions Against ... 287

ther susceptible or highly susceptible (Fig. 1 ). In
contrast, based on capsule damage, 58.57 % of
the accessions was rated highly resistant, while
22.85 % was rated as resistant. In the second field
evaluation, many accessions were rated suscep-
tible or highly susceptible, where as only lesser
proportion was rated “HR” or “R” or “MR”. A
significant difference was observed between two
seasons with regard to total number of accessions
observed under each category for the respective
plant part. Based on the above, five accessions

tolerant to A. catalaunalis were selected (Balaji

2006 ). Culminating from these reports and col-

lections from All India Coordinated Research

Project on Niger and Sesame at Jabalpur, Mad-

hya Pradesh and Regional Research Station, Vri-

dachalam, Tamilnadu, accessions namely NIC-

7875, NIC-78, IVTS-2001-7, NIC-16278, NIC-

17345, KMR 63, KMR-102, KMR 56, TMV-3,

and SVPR-1 were selected for inducing muta-

genesis.

Table 4 Scoring sesame accessions for resistance to A. catalaunalis
Per cent damage Resistance rating
Leaf Flower Capsule Score
0–2 0–1 0–1 1 Highly resistant (HR)

2–4 > 1–2 > 1–2 3 Resistant (R)
4–6 > 2–3 > 2–3 5 Moderately resistant (MR)
6–8 > 3–4 > 3–4 7 Susceptible (S)
8 > 4 >4 9 Highly susceptible (HS)

Table 5 Cumulative scoring of sesame accessions for resistance to A. catalaunalis
Cumulative score Grade Resistance rating
0–1 1 HR

1–3 3 R
3–5 5 MR
5–7 7 S
7 9 HS

Leafdamage

Flower damage

Capsule damage

0

10

20

30

40

50

60

70

80

90

HR RMRHRRMR

22

20

2 5

20

1 5

10

4 6

11

82

32

3

(^107)
35
Number of accessions
FieldtrialI FieldTrialII
Fig. 1 Resistance reaction of sesame accessions to A. catalaunalis