Crops ›› 2020, Vol. 36 ›› Issue (4): 202-205.doi: 10.16035/j.issn.1001-7283.2020.04.029

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Effects of Different Fungicides on Field Control of Sunflower Sclerotinia Rot

Zhang Haiyang1(), Li Haiyan1(), Meng Qinglin2, He Chaoqun3, Liu Shuqing4   

  1. 1College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, Heilongjiang, China
    2Institute of Plant Protection, Heilongjiang Academy of Agricultural Sciences, Harbin 150000, Heilongjiang, China
    3Heilongjiang Furui Seed Industry Co., Ltd, Harbin 150000, Heilongjiang, China
    4Agricultural Technology Extension Station, InnerMongolia Linxi Agriculture and Animal Husbandry Bureau, Chifeng 024000, Inner Mongolia, China
  • Received:2019-12-11 Revised:2020-03-02 Online:2020-08-15 Published:2020-08-11
  • Contact: Li Haiyan E-mail:ZhangHaiyang_Betty@163.com;byndlihy@126.com

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Abstract:

In order to find out the field control effect of different fungicides on sunflower Sclerotinia sclerotiorum, using the methods of mycelial growth rate and spore germination to determine the inhibitory effects of five fungicides on the mycelial growth and ascospore germination of sunflower Sclerotinia sclerotiorum. A field control test was conducted, and the results showed that 20% penthiopyrod SC had the strongest inhibitory effect on mycelial growth, with the EC50 value of 0.0302μg/mL, followed by 75% nadiwen WG and 50% boscalid WG, with the EC50 values of 0.0370 and 0.2152μg/mL, respectively. The inhibitory effect of 50% boscalid WG on ascospores was strongest, with the EC50 value of 0.0563μg/mL. Field test results showed that the control effect of 50% boscalid WG (89.68%) on sunflower Sclerotinia was the best, with an yield increase of 34.58% compared with the control, and effectively improved agronomic-related traits. Comprehensive consideration of indoor virulence and field medicine, the results of the efficacy test showed that 50% boscalid WG had a good control effect on sunflower Sclerotinia sclerotiorum, and can be used as a rotating fungicide in field.

Key words: Sunflower sclerotinia rot, Fungicide, Mycelium growth, Spore germination, Field control

Table 1

In vitro inhibitory effects of five fungicides on sunflower Sclerotinia sclerotiorum"

处理
Treatment		 药剂
Fungicide		 菌丝生长抑制活性
Inhibitory activity on mycelial growth		 子囊孢子萌发抑制活性
Inhibitory activity on ascospore germination
毒力回归方程
Regression equation
of toxicity		 相关系数
Correlation
coefficient		 EC50
(μg/mL)		 毒力回归方程
Regression equation
of toxicity		 相关系数
Correlation
coefficient		 EC50
(μg/mL)
T1 50%啶酰菌胺WG y=0.6895x+5.6420 0.9624 0.2152 y=1.9962x+9.4901 0.9809 0.0563
T2 20%吡噻菌胺SC y=0.6289x+5.9561 0.9813 0.0302 y=0.7200x+5.3588 0.9969 0.3174
T3 75%拿敌稳WG y=1.0814x+6.5501 0.9899 0.0370 y=0.8147x+5.7690 0.9959 0.1137
T4 10%丙硫唑SC y=0.3634x+5.0242 0.9569 0.8578 y=0.9211x+4.2661 0.9632 6.2627
T5 24%噻呋酰胺SC y=1.5403x+4.4183 0.8896 2.3859 y=0.7113x+4.7850 0.9391 2.0057

Table 2

The control effects of five fungicides on sunflower Sclerotinia sclerotiorum"

处理
Treatment		 药剂
Fungicide		 药后天数Days after using fungicide (d)
7 14
病情指数
Disease index		 平均防效(%)
Average control effect		 病情指数
Disease index		 平均防效(%)
Average control effect
T1 50%啶酰菌胺WG 2.65±1.06cC 82.27±7.11aA 0.90±0.50dC 89.68±5.72aA
T2 20%吡噻菌胺SC 7.04±0.99bcBC 52.91±6.61abAB 3.55±1.13bcdBC 59.33±13.00abAB
T3 75%拿敌稳WG 3.60±0.72bcC 75.94±4.83abA 1.60±0.57cdBC 81.61±6.59aAB
T4 10%丙硫唑SC 8.48±2.29bABC 43.28±15.31bAB 4.90±1.45bcABC 43.85±16.62bAB
T5 24%噻呋酰胺SC 13.80±1.81aAB 7.69±12.10cB 5.88±0.97abAB 32.53±11.09bB
CK H2O 14.95±2.14aA – 8.72±1.22aA –

Table 3

The effects of five fungicides on sunflower yields and its components"

处理
Treatment		 药剂
Fungicide		 实粒率
Rate of filled
seeds (%)		 空壳率
Rate of empty
seeds (%)		 百粒重
100-grain
weight (g)		 单盘重
Weight per
disc (g)		 产量
Yield
(kg/hm2)		 较对照增产
Yield increase compared
with CK (%)
T1 50%啶酰菌胺WG 96.33 3.67 13.09 158.01 3 554.36aA 34.58
T2 20%吡噻菌胺SC 93.80 6.20 11.86 148.76 3 298.97abAB 24.91
T3 75%拿敌稳WG 93.33 6.67 11.85 140.53 2 708.72cdB 2.56
T4 10%丙硫唑SC 90.50 9.50 12.73 152.24 3 247.69abcAB 22.97
T5 24%噻呋酰胺SC 89.17 10.83 12.04 137.61 2 737.95bcdB 3.67
CK H2O 82.29 17.71 11.02 130.66 2 641.03dB –
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