Pyraclostrobin: Toxicity Determination and Control Effect on the Pathogens of Two Rare Fruits

doi:10.11924/j.issn.1000-6850.casb2021-0996

Abstract

Abstract:

The aims are to recommend the fungicides for important diseases of rare fruits in pesticide registration, and effectively change the current situation of a lack of fungicides or no fungicide available for disease control of minor crops. Toxicity determination and field efficacy test were utilized to evaluate the control effect and safety of pyraclostrobin 30% SC in the control of wampee anthracnose and guava leaf spot. The test results showed that pyraclostrobin had better inhibitory effect on the mycelial growth of Colletotrichum gloeosporioides and Pestalotiopsis disseminatum, with EC₅₀ of 0.0321 μg/mL and 2.0167 μg/mL respectively, which were significantly better than the effect of control fungicide of azoxystrobin. Pyraclostrobin 30% SC at 250 mg/kg had a good control effect against wampee anthracnose and guava leaf spot, the control efficacy of fungicide after spraying three times reached 78.68% and 77.45% respectively, which were significantly better than the control fungicide with pyraclostrobin 25% SC 200 mg/kg. In summary, pyraclostrobin 30% SC has a good control effect on both wampee anthracnose and guava leaf spot, and it can be applied and promoted in the control of the two fruit tree diseases.

Key words: pyraclostrobin, Colletotrichum gloeosporioides, Pestalotiopsis disseminatum, toxicity determination, chemical control

CLC Number:

S481

SONG Xiaobing, HUANG Feng, LUO Xiaoling, LIN Peihua, PENG Aitian, LING Jinfeng, CUI Yiping. Pyraclostrobin: Toxicity Determination and Control Effect on the Pathogens of Two Rare Fruits[J]. Chinese Agricultural Science Bulletin, 2022, 38(27): 125-128.

Figures/Tables 2

References 19

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药剂名称	病原菌	毒力回归方程	相关系数(r)	EC₅₀/(μg/mL)	EC₉₀/(μg/mL)
吡唑醚菌酯	C. gloeosporioides	Y=5.7248+0.4853X	0.9788	0.0321	14.0381
吡唑醚菌酯	P. disseminatum	Y=4.8769+0.4042X	0.9796	2.0167	2988.371
嘧菌酯	C. gloeosporioides	Y=4.8377+0.292X	0.9779	3.5971	88211.9269
嘧菌酯	P. disseminatum	Y=4.6898+0.2336X	0.9762	21.2932	6529103.837

药剂名称	病原菌	毒力回归方程	相关系数(r)	EC₅₀/(μg/mL)	EC₉₀/(μg/mL)
吡唑醚菌酯	C. gloeosporioides	Y=5.7248+0.4853X	0.9788	0.0321	14.0381
吡唑醚菌酯	P. disseminatum	Y=4.8769+0.4042X	0.9796	2.0167	2988.371
嘧菌酯	C. gloeosporioides	Y=4.8377+0.292X	0.9779	3.5971	88211.9269
嘧菌酯	P. disseminatum	Y=4.6898+0.2336X	0.9762	21.2932	6529103.837

药剂名称	有效成分用量/(mg/kg)	防治黄皮炭疽病效果		防治番石榴叶斑病效果
药剂名称	有效成分用量/(mg/kg)	平均病指±标准误	平均防效/%	平均病指±标准误	平均防效/%
30%吡唑醚菌酯SC	150	(2.08±0.06) b	68.03 c	(1.86±0.04) b	67.22 c
	200	(1.68±0.09) c	74.24 b	(1.56±0.03) c	72.46 b
	250	(1.39±0.01) d	78.68 a	(1.28±0.03) d	77.45 a
25%吡唑醚菌酯SC	200	(1.78±0.02) c	72.72 b	(1.68±0.07) c	70.33 b
空白对照	–	(6.51±0.05) a	–	(5.66±0.06) a	–

药剂名称	有效成分用量/(mg/kg)	防治黄皮炭疽病效果		防治番石榴叶斑病效果
药剂名称	有效成分用量/(mg/kg)	平均病指±标准误	平均防效/%	平均病指±标准误	平均防效/%
30%吡唑醚菌酯SC	150	(2.08±0.06) b	68.03 c	(1.86±0.04) b	67.22 c
	200	(1.68±0.09) c	74.24 b	(1.56±0.03) c	72.46 b
	250	(1.39±0.01) d	78.68 a	(1.28±0.03) d	77.45 a
25%吡唑醚菌酯SC	200	(1.78±0.02) c	72.72 b	(1.68±0.07) c	70.33 b
空白对照	–	(6.51±0.05) a	–	(5.66±0.06) a	–