Effect of different inoculum levels ofMeloidogyne incognita, Alternaria dauciandRhizoctonia solanion the growth, chlorophyll and carotenoid content and disease progression of carrot (Daucus carotaL.)

L. Ahmad, Z. Siddiqui
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引用次数: 4

Abstract

The economic threshold level of Meloidogyne incognita, Alternaria dauci and Rhizoctonia solani were determined on carrot (Daucus carota L.) under greenhouse conditions. The results revealed that plant length, plant fresh weight, shoot and root dry weight, chlorophyll and carotenoid decreased progressively with the corresponding increase in the inoculum levels of each pathogen. The significant reduction in plant growth parameters, chlorophyll and carotenoid occurred when 2000 or more second stage juveniles (J2s) of M. incognita, 1.0 g or more inoculum of A. dauci or R. solani per kg soil were inoculated. Maximum reduction in plant growth attributes, chlorophyll and carotenoid occurred at the highest inoculum level of the test pathogens. Increase in the inoculum level of M. incognita caused an increase in the number of root galls, while the multiplication of nematode was found inversely related to the inoculum density. The increase in the inoculum levels of A. dauci and R. solani resulted in a progressive increase in leaf blight and crown rot indices and caused a higher reduction in plant growth parameters. The damaging threshold level of M. incognita was 2000 J2 per kg soil while 1.0 g per kg soil of A. dauci or R. solani was threshold level on carrot. The assessment of infestation levels of test pathogens will enable growers to cost-effectively select and implement the management tactics.
不同接种量的根结线虫、链格孢和丝核菌对胡萝卜生长、叶绿素和类胡萝卜素含量及疾病进展的影响
在温室条件下测定了根结线虫(Meloidogyne incognita)、链格孢(Alternaria dauci)和茄丝核菌(Rhizoctonia solani)在胡萝卜(Daucus carota L.)上的经济阈值水平。结果表明,随着各病原菌接种量的增加,株长、植株鲜重、地上部和根部干重、叶绿素和类胡萝卜素含量逐渐降低。当每公斤土壤接种2000个或更多的隐姓埋名M.incognita第二阶段幼崽(J2s)、1.0g或更多的A.dauci或R.solani接种物时,植物生长参数、叶绿素和类胡萝卜素显著降低。植物生长属性、叶绿素和类胡萝卜素的最大减少发生在试验病原体的最高接种水平。随着接种量的增加,隐姓埋植线虫的根冠数量增加,而线虫的繁殖与接种密度呈负相关。A.dauci和R.solani接种量的增加导致叶枯病和冠腐病指数的逐渐增加,并导致植物生长参数的更高降低。隐姓埋名M.incognita对胡萝卜的破坏阈值为每公斤土壤2000 J2,而A.dauci或R.solani对胡萝卜的损害阈值为每千克土壤1.0 g。对测试病原体感染水平的评估将使种植者能够经济高效地选择和实施管理策略。
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来源期刊
Acta Phytopathologica Et Entomologica Hungarica
Acta Phytopathologica Et Entomologica Hungarica Agricultural and Biological Sciences-Plant Science
CiteScore
1.10
自引率
0.00%
发文量
7
期刊介绍: The journal publishes papers on the infectious diseases of plants, damages caused by insects and deals with the basic aspects of chemical and biological protection. Within its field of interest additional topics such as resistance against plant diseases, and physiological, biochemical and molecular questions of plant resistance and susceptibility are also discussed. Publishes book reviews and advertisements.
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