Study on the application techniques of controlling the first generation of Chilo suppressalis by releasing Trichogramma japonicum in early-season rice fields

doi:10.16178/j.issn.0528-9017.20230712

Abstract

Abstract:

In order to clarify the field efficient release application technology of Trichogramma japonicum against the first generation of Chilo suppressalis in early-season rice fields, we conducted a study on the control effects of Trichogramma japonicum under different wasp release initiation time, release amount and number of releases,as well as in combination with chemical control in Zhenhai and Fenghua District of Ningbo City from 2017 to 2018. The results showed that control effect of wasp release from the initial emergence period, the beginning peak period and peak period was best, with a control effect of 54.06%. While the number of releases remained unchanged, control effects of release 40 000 and 50 000 every 667 m² were 65.65% and 67.32%, respectively,which were significantly higher than the effect of 30 000 every 667 m².While the total release amount remained unchanged, the control effects of release times of 3 and 4, were significantly higher than the control effects of release times of 2. The control effect of times of 3 followed by one time of chemical control can significantly improve the comprehensive control effect against the Chilo suppressalis and its control effect was equivalent to that of two times of chemical control. Therefore, in order to ensure the control measures of releasing Trichogramma japonicum are cost-effective,it is necessary to determine the reasonable release time, amount and frequency based on the actual occurrence of the overwintering generation of Chilo suppressalis, when Trichogramma japonicum was applied to control the first generation of Chilo suppressalis in early-season rice fields.

Key words: Trichogramma japonicum, early-season rice, Chilo suppressalis, control effect

CLC Number:

S435.112.1

CHEN Jianghua, DI Rui, XIAO Shan, CHAI Weigang, REN Shaopeng, CHEN Ruoxia. Study on the application techniques of controlling the first generation of Chilo suppressalis by releasing Trichogramma japonicum in early-season rice fields[J]. Journal of Zhejiang Agricultural Sciences, 2024, 65(11): 2676-2679.

Figures/Tables 4

References 15

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处理	放蜂起始日期 (月-日)	枯心率/%	防治效果/%
蛾初期	04-28	1.40±0.12 B b	38.89±2.90 C c
蛾始盛期	05-05	1.06±0.10 CD c	54.06±2.08 AB ab
蛾盛期	05-10	1.24±0.10 BC b	46.03±2.62 BC bc
农民自防田	05-24(施药1次)	0.89±0.12 D c	61.57±2.78 A a
不防治对照田		2.29±0.15 A a	0

处理	放蜂起始日期 (月-日)	枯心率/%	防治效果/%
蛾初期	04-28	1.40±0.12 B b	38.89±2.90 C c
蛾始盛期	05-05	1.06±0.10 CD c	54.06±2.08 AB ab
蛾盛期	05-10	1.24±0.10 BC b	46.03±2.62 BC bc
农民自防田	05-24(施药1次)	0.89±0.12 D c	61.57±2.78 A a
不防治对照田		2.29±0.15 A a	0

处理	枯心率/%	防治效果/%
667 m²放蜂5万头	0.90±0.16 B b	67.32±2.21 A a
667 m²放蜂4万头	0.92±0.06 B b	65.65±2.89 A a
667 m²放蜂3万头	1.18±0.18 B b	56.69±3.48 A b
农民自防田	0.93±0.09 B b	65.45±1.95 A a
不防治对照田	2.74±0.40 A a	0

处理	枯心率/%	防治效果/%
667 m²放蜂5万头	0.90±0.16 B b	67.32±2.21 A a
667 m²放蜂4万头	0.92±0.06 B b	65.65±2.89 A a
667 m²放蜂3万头	1.18±0.18 B b	56.69±3.48 A b
农民自防田	0.93±0.09 B b	65.45±1.95 A a
不防治对照田	2.74±0.40 A a	0

处理	枯心率/%	防治效果/%
放蜂4次	1.74±0.24 B c	63.47±2.48 AB a
放蜂3次	1.76±0.21 B c	62.79±1.84 AB a
放蜂2次	2.15±0.10 B b	54.11±1.64 B b
农民自防田	1.67±0.15 B c	64.65±1.79 A a
不防治对照田	4.71±0.32 A a	0