Nematodes Associated with Carrot Production in Tasmania, Australia, and the Effect of Pratylenchus crenatus on Yield and Quality of Kuroda-Type Carrot

Plant Disease
Frank S Hay, Sarah J Pethybridge

Abstract

A survey for nematodes in carrot crops in northern Tasmania detected lesion nematode (Pratylenchus spp.) in 28 of 33 crops, with P. crenatus occurring most frequently and P. neglectus, P. thornei, and P. penetrans occurring infrequently. Root-knot nematode was detected in five of 33 carrot crops, with Meloidogyne fallax present in two crops. The effect of P. crenatus on yield and quality of Kuroda-type carrot was assessed in 42 plots arranged in a 6 × 7 lattice in each of two commercial crops. High numbers of P. crenatus were recovered from fine roots at 58 days after sowing (DAS). However, following formation of the taproot, low numbers were recovered. In both crops, there was a significant negative correlation between numbers of P. crenatus per gram dry weight of root at 58 DAS and the dry weight of root and shoot at 58 DAS. However, the low numbers of P. crenatus/g dry weight of root recovered at subsequent sampling times, and the lack of an increase in the number of P. crenatus in the soil during the season, suggested that Kuroda-type carrot became resistant to P. crenatus following taproot formation. In both crops, P. crenatus populations were significantly negatively correlated with plant density and in one crop with aver...Continue Reading

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.