VARIATION IN RICE TUNGRO VIRUS TRANSMISSION ABILITY BY GREEN LEAFHOPPER, Nephotettix virescens DISTANT (HOMOPTERA: CICADELLIDAE) ON RICE RESISTANT VARIETIES

Widiarta, I Nyoman; Bastian, Adolf; Pakki, Syahrir

doi:10.21082/ijas.v15n2.2014.65-70

Cited by 3 publications

(11 citation statements)

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“…The purpose of the rotation of the cultivars with different resistance genes against the vector is to prevent the vector from adapting to a certain resistance gene, thus the GLH populations are suppressed and consequently, the RTV incidence is also reduced (Sama et al, 1991;Widiarta, 2014). The GLH adaptability to a resistance gene can be assessed based on percent of first instars developing to second instars nymphs (Hirae et al, 2007), nymphal development index (Cook, 1991), ability to transmit RTV in seedling test (Widiarta et al, 2013) and the GLH population and RTV incidence in the field (Heinrichs and Rapusas, 1983;Yuliani, 2014). An insect colony is considered adapting to a certain resistance gene if these parameters on the cultivar carrying the gene are not significantly different from those on a cultivar without a resistance gene, such as TN-1.…”

Section: Discussionmentioning

confidence: 99%

“…A colony of the GLH is considered adaptable or virulent to a certain resistant gene if the percentage of the infection on the cultivars carrying the resistance gene is not significantly different from the infection rate on TN-1 (no resistance gene). On the other hand, if the infection rate on the resistant cultivar is significantly lower than on TN-1, the colony is not adaptable to the cultivar (Widiarta et al, 2004;Widiarta et al, 2013;Hirae et al, 2007).…”

Section: Transmission Efficiency Testmentioning

confidence: 99%

“…Efficiency of each of the GLH colonies in transmitting RTV to different cultivars with different resistance genes to GLH, TN-1 (no resistance gene), IR 46 (Glh 1), Ciliwung (Glh 5), IR 48 (Glh 6) and IR 66 (glh-4) was evaluated using a no-choice seedling test, following the method of (Widiarta et al, 2013). Adult population of each colony were placed into an aluminum-framed cage (40 25 40 cm), containing RTV-infected plants for a 24 h acquisition feeding.…”

Section: Transmission Efficiency Testmentioning

confidence: 99%

“…*Cultivar reactions: Resistant = 0-30%, moderately resistant = >30-60% and susceptible = >60%. **Adapted = percent of transmission is not significantly different from TN-1, Not adapted = transmission rate is significantly lower than TN-1 (Widiarta et al, 2013)…”

Section: Detection Of Rice Tungro Virus In Weedsmentioning

confidence: 99%

“…An integrated management of tungro disease was implemented by combining appropriate planting time and varietal rotation (Praptana and Muliadi, 2013;Widiarta et al, 2013). The planting time was planned in such a way that the susceptible life stage of the plant to tungro infection (<45 days after transplanting) was not coincident with the occurrence of high vector population and the abundance of virus inoculum in the field.…”

Section: Introductionmentioning

confidence: 99%

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Epidemiological Study on the Current Status of Rice Tungro Disease in South Sulawesi, Indonesia

Rosida¹,

Kuswinanti²,

Amin³

et al. 2020

OnLine Journal of Biological Sciences

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Integrated management of Rice Tungro Disease (RTD) by combining the appropriate planting time and cultivar rotation has successfully controlled the disease in South Sulawesi, Indonesia. By the early 1990's, about 10 years after the management was implemented, tungro disease incidence was so low that the integrated management was no longer strictly implemented and eventually abandoned. Surprisingly however, the tungro incidence steadily decreases in the area ever since. Therefore, the purpose of the study was to elucidate why the rice tungro disease incidence decreases even when the integrated management is no longer in place. A series of studies was conducted to determine the adaptability of rice Green Leafhopper (GLH), Nephotettix virescens, colonies on different cultivars with different resistance genes against the leafhopper, tungro transmission efficiency in laboratory and in field and tungro viruses (RTBV and RTSV) detection in weeds. The results indicated that all GLH colonies had adapted to all cultivars carrying different GLH resistance genes. For each colony, there were no significant differences between the resistant cultivars and TN-1 (no GLH resistance gene) in: (1) Percent of first instars developing to the second instar nymphs, (2) nymphal development indices, (3) tungro virus transmission efficiency and (4) GLH populations. The PCR results showed that none of the weeds tested contained the rice tungro viruses. Therefore, the study results suggested that the lack of rice tungro inoculums in the weeds was the main reason why tungro incidence decreases from time to time. However, if the rice tungro viruses are reintroduced to the region, the RTD can become devastating because the GLH colonies have already adapted to all available resistance genes. Further studies should be conducted to find and incorporate new resistance genes into commercial cultivars.

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Section: Discussionmentioning

confidence: 99%

Section: Transmission Efficiency Testmentioning

confidence: 99%

Section: Transmission Efficiency Testmentioning

confidence: 99%

Section: Detection Of Rice Tungro Virus In Weedsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Epidemiological Study on the Current Status of Rice Tungro Disease in South Sulawesi, Indonesia

Rosida¹,

Kuswinanti²,

Amin³

et al. 2020

OnLine Journal of Biological Sciences

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Biodiversity of herbivorous insects in rice organic and inorganic ecosystem

Aminah,

Fatahuddin,

Nurhidayat

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Since many years, presence and activities of herbivorous insect very crucial in the agricultural ecosystem. Purpose of the research is to study biodiversity of herbivorous insect in the rice organic and inorganic ecosystem. The research was conducted in Salassae village, Bulukumba Regency, South Sulawesi from June to August 2021. The herbivorous insect from organic and inorganic ecosystem was carried out and identified at the Pest Laboratory, Department of Plant Pest and Diseases, Faculty of Agriculture, Hasanuddin University Makassar. The places used in the research divided into organic and inorganic rice ecosystem, with measurement 25 m x 25 m, respectively. The insect samples collected used ubinan system methods with diagonal intersection applied for pitfall trap. The samples from organic and inorganic ecosystem analyzed by Shannon-Wiener Index Diversity. The result of Shannon-Wiener Index was showed the higher number of herbivorous insects in the inorganic rice ecosystem (H’ = 1.71) with population about 391 individual (51%). In contrast, result of organic ecosystem (H’ = 1.68) lower than inorganic. Conclusion of the research: 1) the higher number of herbivorous insects in the inorganic rice ecosystem (H’ = 1.71), the lowest result from organic ecosystem (H’ = 1.68); 2) the highest rice harvest higher the organic ecosystem (297 kg) and the lowest in the inorganic (279.2 kg).

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Keanekaragaman Dan Dominansi Serangga Parasitoid Telur Berdasarkan Fase Pertumbuhan Tanaman Padi

Hendrival,

Rahayu,

Perdamaian

et al. 2022

Agritech

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The insect egg parasitoid is a potential agent of biological control for pest, especially concerning the development of technology alternative pest control. The existing species of egg parasitoids in rice agroecosystems needs is known for their use as pest control an effective and efficient. The research aimed to determine of diversity, dominance, and parasitization levels for species of egg parasitoids in rice agroecosystems based on plant growth. The location research and sampling of parasitoids were done in Matangkuli and Syamtalira Aron sub-districts, North Aceh district, and Kuta Malaka sub-districts, Aceh Besar district, Province Aceh. The sampling was done in the vegetative stage from 20 to 40 and generative from 70 to 90 days after planting (DAT). Groups of eggs collected from the sampling location were then observed and identified at the Laboratory of Plant Pests and Diseases, Faculty of Agriculture, Malikussaleh University, Aceh. The results showed that egg parasitoids found in the rice agroecosystem form Order Hymenoptera, superfamily Chalcidoidea, species Ooencyrtus malayensis (Encyrtidae) and Tetrastichus schoenobii (Eulophidae). Superfamily Platygasteroidae, species Telenomus triptus (Scelionidae) and Hadronotus leptocorisae (Scelionidae). The number of individuals and diversity of egg parasitoids were low in vegetative than generative. The evenness index in both growth stages belongs to high. Species of T. triptus and T. rowani were dominant egg parasitoids found in the rice agroecosystem in both growth stage. The level of parasitization to parasitoid T. triptus, T. rowani, and Te. schoenobii is generally known as > 50%, species O. malayensis and H. leptocorisae less than 50%

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VARIATION IN RICE TUNGRO VIRUS TRANSMISSION ABILITY BY GREEN LEAFHOPPER, Nephotettix virescens DISTANT (HOMOPTERA: CICADELLIDAE) ON RICE RESISTANT VARIETIES

Cited by 3 publications

References 0 publications

Epidemiological Study on the Current Status of Rice Tungro Disease in South Sulawesi, Indonesia

Epidemiological Study on the Current Status of Rice Tungro Disease in South Sulawesi, Indonesia

Biodiversity of herbivorous insects in rice organic and inorganic ecosystem

Keanekaragaman Dan Dominansi Serangga Parasitoid Telur Berdasarkan Fase Pertumbuhan Tanaman Padi

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