Comparative Efficacies of Next-Generation Insecticides Against Yellow Stem Borer and Their Effects on Natural Enemies in Rice Ecosystem

doi:10.1016/j.rsci.2019.04.002

Abstract

Abstract:

The efficacies of some next-generation insecticides against the rice yellow stem borer (YSB), Scirpophaga incertulas (Walk.), and their compatibilities with natural enemies were investigated during 2014 and 2015. Three newer insecticides, chlorantraniliprole 0.4% G, dinotefuran 20% SG, and methoxyfenozide 24% SC, and two commonly used insecticides, carbufuran 5 G and quinalphos 25 EC, were evaluated in the field for their efficacies against YSB and their non-target effects on natural enemies. Application of chlorantraniliprole 0.4% G at 10.96 kg/hm² resulted in the greatest reduction in YSB infestation (deadhearts and whiteheads) and greatest increase of yield compared to the untreated control plots, followed by methoxyfenozide 24% SC at 0.41 L/hm², dinotefuran 20% SG at 0.15 kg/hm², carbufuran 5 G at 10.96 kg/hm², and quinalphos 25 EC at 1.50 L/hm². All the insecticides reduced the numbers of predators viz., lady bird beetles, wolf spiders, carabid beetles, earwigs, green mirid bugs, and damselflies. Numbers of adults of the egg parasitoids Trichogramma sp., Telenomus sp. and Tetrastichus sp. were significantly reduced in insecticide-treated plots compared to untreated control plots. In all field trials, the harmful effects of the five insecticides were in the following rank order (least harmful to most harmful): chlorantraniliprole 0.4% G, carbufuran 5 G, dinotefuran 20% SG, methoxyfenozide 24% SC, and quinalphos 25 EC. On the basis of reduction in YSB infestation, increase in grain yield, and compatibility with natural enemies, chlorantraniliprole 0.4% G was proved to be the best of all the insecticides for YSB management system, although the study suggested minimizing its retail price for enhancement of cost effectiveness in farmers’ fields.

Key words: insecticide, yellow stem borer, natural enemy, chlorantraniliprole, rice yield

Matiar Rahaman Muhammad, Joseph Stout Michael. Comparative Efficacies of Next-Generation Insecticides Against Yellow Stem Borer and Their Effects on Natural Enemies in Rice Ecosystem[J]. Rice Science, 2019, 26(3): 157-166.

Figures/Tables 15

References 45

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Treatment	Insecticide name	Insecticide class	Formulated product (Active ingredient)	Manufacturer/Source
T1	Carbufuran 5 G	Carbamate	10.96 kg/hm² (0.55 kg/hm²)	Masco Agro Chemicals
T2	Chlorantraniliprole 0.4% G	Anthranilic diamide	10.96 kg/hm² (0.55 kg/hm²)	Patrocom (BD) Ltd.
T3	Dinotefuran 20% SG	Neonicotinoid	0.15 kg/hm² (0.05 kg/hm²)	Indofil Industries Ltd.
T4	Methoxyfenozide 24% SC	Diacylhydrazine	0.41 L/hm² (0.10 kg/hm²)	Auto Crop Care Ltd.
T5	Quinalphos 25 EC	Organophosphate	1.50 L/hm² (0.38 kg/hm²)	Shadik Agrochemicals Company
T6	Untreated control	-	-	-

Treatment	Insecticide name	Insecticide class	Formulated product (Active ingredient)	Manufacturer/Source
T1	Carbufuran 5 G	Carbamate	10.96 kg/hm² (0.55 kg/hm²)	Masco Agro Chemicals
T2	Chlorantraniliprole 0.4% G	Anthranilic diamide	10.96 kg/hm² (0.55 kg/hm²)	Patrocom (BD) Ltd.
T3	Dinotefuran 20% SG	Neonicotinoid	0.15 kg/hm² (0.05 kg/hm²)	Indofil Industries Ltd.
T4	Methoxyfenozide 24% SC	Diacylhydrazine	0.41 L/hm² (0.10 kg/hm²)	Auto Crop Care Ltd.
T5	Quinalphos 25 EC	Organophosphate	1.50 L/hm² (0.38 kg/hm²)	Shadik Agrochemicals Company
T6	Untreated control	-	-	-

Category	Common name	Scientific name	Family	Order
Predator	Lady bird beetle	Micraspis discolor	Coccinellidae	Coleoptera
	Wolf spider	Lycosa pseudoannulata	Lycosidae	Araneae
	Carabid beetle	Ophionea indica	Carabidae	Coleoptera
	Earwig	Forticula auricularia	Forticulidae	Dermaptera
	Green mirid bug	Cyrtorhinus lividipennis	Miridae	Heteroptera
	Damsel fly	Agriocnemis pygmaea	Coenagrionidae	Odonata
Parasitoid		Trichogramma japonicum	Trichogrammatidae	Hymeoptera
		Telenomus rowani	Scelionidae	Hymeoptera
		Tetrastichus schoenobii	Scelionidae	Hymeoptera

Category	Common name	Scientific name	Family	Order
Predator	Lady bird beetle	Micraspis discolor	Coccinellidae	Coleoptera
	Wolf spider	Lycosa pseudoannulata	Lycosidae	Araneae
	Carabid beetle	Ophionea indica	Carabidae	Coleoptera
	Earwig	Forticula auricularia	Forticulidae	Dermaptera
	Green mirid bug	Cyrtorhinus lividipennis	Miridae	Heteroptera
	Damsel fly	Agriocnemis pygmaea	Coenagrionidae	Odonata
Parasitoid		Trichogramma japonicum	Trichogrammatidae	Hymeoptera
		Telenomus rowani	Scelionidae	Hymeoptera
		Tetrastichus schoenobii	Scelionidae	Hymeoptera

Treatment	Deadheart in each plot (Mean ± SE, n = 3)				Reduction over control
Treatment	1 DBS	5 DAS	10 DAS	15 DAS	5 DAS	10 DAS	15 DAS
T1	4.06 ± 0.05	4.06 ± 0.31 b	4.82 ± 0.09 b	5.31 ± 0.09 b	68.18	69.18	67.1
T2	3.89 ± 0.13	2.02 ± 0.11 c	2.84 ± 0.23 d	3.45 ± 0.07 d	84.16	81.84	78.62
T3	3.55 ± 0.25	3.80 ± 0.02 b	4.19 ± 0.10 c	5.22 ± 0.17 b	70.21	73.2	67.65
T4	3.56 ± 0.16	2.65 ± 0.15 c	3.81 ± 0.12 c	4.18 ± 0.23 c	79.23	75.63	74.1
T5	3.33 ± 0.27	4.44 ± 0.08 b	5.00 ± 0.27 b	5.39 ± 0.19 b	65.2	68.03	63.5
T6	3.62 ± 0.18	12.76 ± 0.45 a	15.64 ± 0.18 a	16.14 ± 0.21 a	-	-	-
LSD_0.05	0.606	0.823	0.527	0.427
Level of significance	NS	**	**	**
CV (%)	9.05	9.13	4.78	3.34
F-test	1.857	226.267	812.29	1368.96