Abstract

Aim: Main purpose of the study was to assess the phytotoxic compatibility and bio-efficacy studies of insecticides and fungicides alone and in combinations against brown planthopper (BPH) and blast disease in rice.

Materials and Methods: The treatments were imidacloprid+ethiprole 80 WG @ 0.25 g/L; dinotefuran 20 SG @ 0.4 g/L; tricyclazole 75 WP @ 0.6 g/L and isoprothiolane 40 EC @ 1.5 ml/L and their tank mix combination and untreated control.

Results: During rabi 2012-13, imidacloprid+ethiprole 80 WG with isoprothiolane 40 EC (82.22%) and dinotefuran 20 SG in combination with isoprothiolane 40 EC (53.28%) recorded highest per cent reduction of BPH population and leaf blast incidence respectively. During rabi, 2013-14, both the insecticides, dinotefuran 20 SG and imidacloprid+ethiprole 80 WG with tricyclazole 75 WP recorded 73.70 and 70.66% reduction in BPH population over untreated control respectively. Whereas, imidacloprid+ethiprole 80 WG with tricyclazole 75 WP recorded 56.28% reduction in leaf blast incidence over untreated control.  During rabi 2012-13, dinotefuran 20 SG (5447 kg/ha) and during rabi 2013-14, imidacloprid+ethiprole 80 WG (5196 kg/ha) recorded highest grain yields in combination with tricyclazole 75 WP. Overall mean results indicated that imidacloprid+ethiprole 80 WG in combination with tricyclazole proved to be the most effective recording the highest reduction in leaf blast incidence (48.72%) and severity (60.41%) along with the maximum yield increase over control (83.47%). Imidacloprid+ethiprole 80 WG in combination with isoprothiolane was the most effective against BPH, showing the highest reduction (75.14%).

Conclusion: It was concluded that tank mixing of imidacloprid+ethiprole 80 WG with tricyclazole 75 WP and dinotefuran 20 SG in combination with both the fungicides i.e.  tricyclazole 75 WP and isoprothiolane 40 EC were compatible with each other and can be safely used as tank mix at the time of simultaneous occurrence of BPH and blast disease.

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