New Horizons in Insect Science Towards Sustainable Pest Management

156 V. M. Chavan

alternate sprays of dimethoate and azadirachtin
(0.22 aphids/plant) was followed by other effec-
tive treatments of acetamiprid (0.005 %), imida-
cloprid (0.01 %), thiamethoxam (0.005 %), and
azadirachtin (4 ml/lt).

Management of Incidence of PRSV (P)

As observed after each spray application

(Table 2 ), all the treatments showed significant

reduction in disease incidence caused by PRSV

on papaya plants in the field as compared to

Table 2 Management of PRSV (P) on papaya

Mean incidence of PRSV (P) (%)

Treatments 1st spray 2nd spray 3rd spray 4th spray Pooled

Thiamethoxam 0.005 % 8.33 25 64.58 80 44.48

(16.60a (29.22) (54.44) (63.93) (43.01)

Imidacloprid 0.01 % 6.67 31.67 61.64 76.48 44.12

(14.76) (33.24) (51.71) (61.96) (42.08)

Acetamiprid 0.005 % 5.00 28.33 63.33 76.67 43.33

(7.60) (30.38) (53.39) (66.15) (41.75)

Buprofezin 0.025 % 1 1.67 43.33 73.15 82.92 52.77

(19.90) (41.07) (59.73) (66.34) (47.42)

Dimethoate 0.05 % 10 35 68.33 81.48 48.70

(18.05) (35.59) (56.33) (65.25) (44.44)

Azadirachtin 4 ml/L (Nimbicidin 0.03 EC) 10 33.33 66.67 81.67 47.92

(18.05) (34.92) (55.01) (65.00) (44.22)

Border crop of maize + fortnightly

alternate spray of dimethoate 0.05 % and

azadirachtin 4 ml/L (Nimbicidin 0.03 EC)

5.00 11.67 25.00 48.33 22.50

(10.45) (16.45) (28.45) (44.03) (28.14)

Untreated 11.67 51.67 90 100 64.58

(23.85) (45.90) (72.53) (90) (54.75)

S.E.m. + 3.90 7.11 6.28 4.77 2.71

C.D. at 5 % N.S. N.S. 19.05 14.47 8.22

NS non significant

aFigures in parentheses are arc sine transformed values

Table 1 Management of aphid vectors on papaya

Treatments Mean number of survival aphids per plant

1st spray 2nd spray 3rd spray 4th spray Pooled

Thiamethoxam 0.005 % 0.73 0.31 0.76 0.44 0.56

Imidacloprid 0.01 % 0.87 0.20 0.58 0.33 0.51

Acetamiprid 0.005 % 0.56 0.33 0.69 0.24 0.46

Buprofezin 0.025 % 0.91 0.65 1.36 0.33 0.81

Dimethoate 0.05 % 1.60 0.38 0.87 0.36 0.80

Azadirachtin 4 ml/L (Nimbicidin 0.03 EC) 0.89 0.42 0.76 0.29 0.59

Border crop of maize + fortnightly alternate

spray of dimethoate 0.05 % and azadirachtin

4 ml/L (Nimbicidin 0.03 EC)

0.29 0.20 0.27 0.13 0.22

Untreated 1.67 0.73 1.76 1.16 1.33

S.E.m.+ 0.18 0.13 0.14 0.12 0.07

C.D. at 5 % 0.54 N.S 0.44 0.35 0.21

NS nonsignificant