Pentasacme wallichii Wight. (Family: APOCYNACEAE): A First Record to Bhutan

Tobgay, Kezang; Gyeltshen, Nima; Dema, Sangay; Wangchuk, Tandin; Gyeltshen, Choki

doi:10.17102/cnr.2019.04

BJNRD

2019

DOI: 10.17102/cnr.2019.04

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Pentasacme wallichii Wight. (Family: APOCYNACEAE): A First Record to Bhutan

Kezang Tobgay¹,

Nima Gyeltshen²,

Sangay Dema³

et al.

Abstract: In Bhutan, the genus Pentasacme Wall. ex Wight. had been represented by only one species, Pentasacme pulcherrima Grierson & Long, which is mainly distributed in shaded steep banks and gully walls in subtropical rainforest at 250-550 m above sea level. During the ongoing 100 Trees species seed conservation project in Bhutan with Millennium Seedbank, Kew, specimens of Pentasacme Wall. ex Wight. were collected from warm broadleaved forest slopes of Zhemgang and Mongar districts at elevation of 680-705 m. These sp… Show more

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Cited by 4 publications

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Clean Citrus Planting Materials Production through Shoot tip Grafting and Biological Indexing

Dorji¹,

Namgay²,

Penjor³

et al. 2022

BJA

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Huanglongbing (Citrus Greening) is the most devastating citrus disease caused by phloem-inhabiting bacteria carried by the insect vector, Asian citrus psyllid (Diaphorina citri). In Bhutan, the production and movement of citrus seedlings and new orchard establishment have been restricted after the Citrus Greening disease was detected in most citrus orchards. To address this problem, Agriculture Research and Development Centre-Wengkhar has initiated research on clean citrus propagation through shoot tip grafting. This study assessed the efficiency of shoot tip grafting for the production of clean planting materials. Sweet orange was used as an indicator plant to study disease transmission and symptom expression in some of the potential and released citrus varieties. A total of 15 plants, 3 plants of each cultivar (AREP-1, AREP-2, Aoshima, Wengkhar Tshelu-2 and Yoshida Ponkan) produced through shoot tip grafting were used for bio-indexing. The cultivars were grafted on indicator plants using different grafting techniques (T-budding, side grafting, wedge, and split grafting). A total of twenty-six samples with two samples per cultivar was sent to the National Plant Protection Centre for PCR analysis. The result of PCR showed negative result for Huanglongbing. Thus, shoot tip grafting could be one potential method for clean citrus planting material production.

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Clean Citrus Planting Materials Production through Shoot tip Grafting and Biological Indexing

Dorji¹,

Namgay²,

Penjor³

et al. 2022

BJA

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Assessment of Seedling Rate per Hill for Irrigated Rice in a Wet Sub-Tropical Condition of Bhutan

Ngawang

Dendup

Tshomo

2022

BJA

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A field experiment was conducted at the research farm of the Agriculture Research and Development Centre (ARDC) Samtenling in Sarpang district of Bhutan in 2020 to assess the effects of transplanting different numbers of seedlings per hill on grain yield and yield components of rice under irrigated conditions. A widely adopted rice variety, Bhur Kambja-1, was used for the study with one to seven seedlings per hill transplanted at 20×20 cm spacing. The experiment was laid out in a randomized complete block design with three replications. The results of the experiment revealed that the number of seedlings per hill had a significant effect on number of tillers per hill and grain yield. In terms of rice grain yield, a significant difference was observed only between three and seven seedlings per hill with a recorded yield of 3.9 and 2.7 t ha-1, respectively. However, no significant effect was established on other yield components, such as the plant height, panicle length, number of grains per panicle, and unfilled grains per panicle. Therefore, this study recommends transplanting three seedlings hill-1 for cultivation of Bhur Kambja-1 rice variety in the wet-subtropical condition of Bhutan as three seedlings per hill yielded significantly higher productivity and could potentially reduce the seed rate.

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Management of Litchi Fruit and Shoot Borer (Conomorpha sinensis) in Three Litchi Varieties in Samtenling, Bhutan

Kinley¹,

Dhimal²

2022

BJA

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In Bhutan, litchi production is constrained by insect pest damage. Among insect pests, the litchi fruit and shoot borer (Conopomorpha sinensis Bradley) is an emerging pest of economic importance in the subtropical regions of Bhutan. Up until now, there is documented research on its biology and management in Bhutan. Therefore, this study was undertaken to study the efficacy of two different management methods against litchi fruit borer infestation in three litchi varieties (Bhur litchi 1, Bhur litchi 2 & Hong houy). The management methods consisted of three treatments; T1-Azadirachtin followed by Imidacloprid, Azadirachtin and Cypermethrin; T2-Azadirachtin followed by Imidacloprid, Azadirachtin and Azadirachtin; T3-Untreated control. The result showed that the fruit infestation at harvest was significantly lower in management method T1 (34.74%) as compared to T2 (78.07%) and untreated control (89.98%). In terms of the variety, the lowest fruit infestation at harvest was observed for Hong houy (56.02%) as compared to Bhur Litchi 1 (73.28%) and Bhur Litchi 2 (73.45%). There were no significant differences in fruit drop percent and percent infestation of dropped fruits between the treatments and varieties tested. Heavy fruit drop was observed in the third week, due to unknown reasons, which then decreased over the fruit development stages. Fruit borer infestation seems to increase rapidly after the fifth and eighth weeks indicating that most of the fruit borer damage occurs at the fruit maturity stage after fruit colour break. Therefore, the last application of cypermethrin 10% EC at the fruit colour break stage was found necessary to reduce fruit infestation during this vulnerable pest infestation period besides scheduled application of Azadirachtin and Imidacloprid at the early fruit development period.

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Pentasacme wallichii Wight. (Family: APOCYNACEAE): A First Record to Bhutan

Cited by 4 publications

References 1 publication

Clean Citrus Planting Materials Production through Shoot tip Grafting and Biological Indexing

Clean Citrus Planting Materials Production through Shoot tip Grafting and Biological Indexing

Assessment of Seedling Rate per Hill for Irrigated Rice in a Wet Sub-Tropical Condition of Bhutan

Management of Litchi Fruit and Shoot Borer (Conomorpha sinensis) in Three Litchi Varieties in Samtenling, Bhutan

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