|Table of Contents|

Effects of Planting Density on Main Diseases and Agronomic Characters and Study on Field Pesticide Screening of Marigold

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2021年21
Page:
78-85
Research Field:
Publishing date:

Info

Title:
Effects of Planting Density on Main Diseases and Agronomic Characters and Study on Field Pesticide Screening of Marigold
Author(s):
ZHAO Dailin; HE Haiyong; TAN Qingqun; YANG Xuehui
(Institute of Plant Protection,Guizhou Academy of Agricultural Sciences,Guiyang,Guizhou 550006)
Keywords:
planting density; marigold; black spot; gray mould; biological control
PACS:
-
DOI:
10.11937/bfyy.20210987
Abstract:
‘Pigment No.1’ of marigold was used as experimental material,field experiments were conducted to study the effects of three planting densities on the main diseases and agronomic traits of marigold,and the field control effects of ten biopesticides,one biocontrol strain and five low-toxicity chemical pesticides on the main diseases of marigold were determined,in order to provide reference basis for improving the yield and quality and controlling the main diseases of marigold.The results showed that planting densities were positively correlated with disease severity,yield and number of flowers,and negatively correlated with plant height,stem diameter,average fresh weight of single flower and average dry weight of single flower,and the optimal planting density was 30 cm×75 cm(4.89 plants·hm-2).Among the ten biopesticides,psoralea seed extract microemulsion and Bacillus cereus wettable powder had better control effects on marigold black spot,with control effect of 65.08% and 64.39%,respectively,followed by Bacillus subtilis wettable powder,with control effect of 61.47%.Wofengkang-kexiansan powder and microbial agents had better control effects on marigold grey mould,with control effect of 65.55% and 64.46%,respectively,followed by tucuan 3 suspension agent,with control effect of 60.62%.The control effect of biocontrol strain GYSW-6m1 against black spot and gray mould of marigold was 63.34% and 53.93%,respectively.Among the five low-toxicity chemicals,325 g·L-1benzyl azoxystrobin suspension and 125 g·L-1epoxiconazole suspension had better control effects on marigold black spot,with control effect of 70.56% and 70.33%,respectively.125 g·L-1epoxiconazole suspension had the best control effect on marigold grey mould with 67.85%,followed by 325 g·L-1 benzyl azoxystrobin suspension and 450 g·L-1prochloraz aqueous emulsion with control effect of 63.59% and 63.37%,respectively.

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Last Update: 2022-01-14