Volume 11 - 2021 -


1. Morphological study of nematode on Norfolk Island Pine (Araucaria heterophylla) reveal close relatedness with Deladenus uteropinusus and is the first record in Chiang Mai, Thailand

Authors: Chairat K, Withee P, Maneepitaksanti W, Krutmuang P, Chairin T, To-anun C

Recieved: 29 October 2020, Accepted: 01 February 2021, Published: 23 February 2021

The nematodes, Deladenus sp. obtained from withering pine trees, Araucaria heterophylla, at Chiang Mai, Thailand during April 2016 were morphologically studied. The nematodes were pinned with 70% warm ethanol and cleared by glycerin and morphologically classified according to the method of Deman (1876). The amphimictic nematodes were characterized mainly by the presence of 6 lateral incisures, a cephalic region low, the lip region offset from body, well-developed stylet with its shaft longer than a cone and with single guild ring, excretory pore positioning behind the hemizonid and six lateral incisures in both sexes. The mycetophagous female was 1,133.3±34.4 (1,100-1,200) µm in body length, 41±2.8 (36-46) µm in body width and 11.5±0.8 (10-13) µm in stylet length. Moreover, a large vulva was found with horizontal scratches on the posterior body, protuberant lip without covers, and post-uterine sac. The female tail was cylindrical, rounded, and hyaline. The male was 850±49.3 (850-920) µm in body length, 29.8±4.9 (24-40) µm in body width, 10.8±0.8 (10-11.5) µm in stylet length, and 22.8±2.7 (15.3-26.9) µm in spicule length. Furthermore, a presence of Y-shaped of tylenchoid type spicules was arcuate with pointed spicule tip and conoid tail with lateral membrane bursa. Based on the morphological characters, these nematodes, Deladenus uteropinusus were identified as entomophagous and mycetophagous nematodes. This study was useful for those who are interested in controlling wilting disease of pine trees and other plants.

Keywords: Araucaria heterophylla – Deladenus uteropinusus – Entomophagous nematode – Morphology of nematode – mycetophagous nematode

 

2. First report of leaf spot disease on Woodfordia fruticosa caused by Corynespora cassiicola in Kerala, India

Authors: Sreelakshmi VP, Kumar S, Rekha R, Nair B, George NM, Singh R

Recieved: 16 September 2020, Accepted: 24 February 2021, Published: 04 March 2021

Woodfordia fruticosa (L.) Kurz (Lythraceae), a significant medicinal plant used for curing various diseases, was severely affected with leaf spot disease in medicinal plants garden of Kerala Forest Research Institute, Peechi. Based on morphological characteristics the pathogen was identified as Corynespora cassiicola (Burk. & Curt.) C.T. Wei. To the best of our knowledge this is the first report of leaf spot disease caused by C. cassiicola on W. fruticosa in Kerala, India.

Keywords: Fungal diseases – identification – new report – pathogenicity

 

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Plant Pathology & Quarantine Online publishes reviews, research articles, methodology papers, and taxonomic works in the field of plant pathology. The official journal language is English.

 

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