Mating Disruption of Striped Rice Stem Borer: Importance of Early Deployment of Dispensers and Impact on Airborne Pheromone Concentration

doi:10.1016/j.rsci.2021.09.001

Abstract

Gavara Aitor, Vacas Sandra, Primo Jaime, Navarro-Llopis Vicente. Mating Disruption of Striped Rice Stem Borer: Importance of Early Deployment of Dispensers and Impact on Airborne Pheromone Concentration[J]. Rice Science, 2021, 28(6): 525-528.

Figures/Tables 3

Fig. 1. Results of different deployment strategies (Early and Late): Male flights, dispensers’ emission rates and airborne pheromone quantifications.A, No. of male captures per trap per day (CTD) throughout the crop season with different mating disruption treatments. Early deployment of pheromone dispensers was conducted in May of 2019 and late deployment in June of 2019. Values are Mean ± SE (n = 4). B, Residual pheromone content of bioselibate C. suppressalis dispensers installed in May and June vs. the time of field exposure. C, Absolute airborne pheromone concentrations in the rice field treated with passive dispensers Bioselibate C. suppressalis installed at 24 May, 2019. Air samples were collected monthly from June to September during the crop cycle. Bars labelled with different lowercase letters are significantly different by one-way analysis of variance followed by the Fisher's LSD test (P < 0.05). Values are Mean ± SE (n = 4).

Table 1 Number of infested plants per square meter and percentage of attacked plants (%) obtained with each treatment in the damage assessment carried out after the second male flight and at post-harvest.

Treatment	Assessment after 2nd flight			Post-harvest assessment
Treatment	Sample number	No. of infested plants per square meter	Percentage of attacked plants (%)	Sample number	No. of infested plants per square meter	Percentage of attacked plants (%)
Early	31 520	0.21 ± 0.10 a	0.11 ± 0.06	809	42.20 ± 14.20 a	26.20 ± 8.80
Late	32 000	0.41 ± 0.18 b	0.19 ± 0.09	779	51.20 ± 11.80 b	35.90 ± 10.20

Table S1. Optimum values of the MS/MS parameters for each target compound to quantify C. suppressalis airborne pheromone.

	Transition	Precursor ion (m/z)	Product ion (m/z)	Collision energy (eV)
TFN	1	375	263	10
TFN	2	393	373	5
Z-11-hexadecenal (main pheromone component)	1	81	77	15
	2	82	67	10
	3	95	67	10
	4	95	93	5

References 10

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