scholarly journals Compatibility of Entomopathogenic Fungi with Neonicotinoids for the Management of Brown Plant Hopper of Rice, Nilaparvata lugens stal. (Delphacidae: Hemiptera)

2021 ◽  
Author(s):  
B. Nagendra Reddy ◽  
V. Jhansi Lakshmi ◽  
T. Uma Maheswari ◽  
G.S. Laha
Keyword(s):  
Entomopathogenic Fungi ◽  
Brown Planthopper ◽  
Nilaparvata Lugens ◽  
Verticillium Lecanii ◽  
Lecanicillium Lecanii ◽  
Farming Community ◽  
Combined Use ◽  
Nilaparvata Lugens Stål ◽  
Continuous Use ◽  
Brown Plant Hopper

Background: Rice is the staple food of Indians and it is attacked by more than 100 species of insects. Among all, brown planthopper (BPH), Nilaparvata lugens (Stal) (Hemiptera: Delphacidae) is one of the major sucking insects, which can cause appreciable damage by sucking sap on other hand transmitting viral diseases. Farming community using several insecticides for managing the BPH. However, continuous use of these insecticides causes health hazards and environmental pollution and also leads to development of insecticide resistance. Keeping this view in mind, the present investigation has been planned with combined use of fungal formulations and commonly used neonicotinoid insecticides in rice eco system for managing BPH. Methods: This experiment was carried out in two parts, one is studied the compatibility between neonicotinoids (Thiamethoxam 25 SG and Dinotefuran 20 SG) and entomopathogenic fungi (Beauveria bassiana, Metarhizium anisopliae and Lecanicillium lecanii =Verticillium lecanii) by following the standard poison food technique. Second one is after studied the compatibility between neonicotinoids and entomopathogenic fungal agents, inhibitory studies were conducted under glasshouse conditions.Result: The study revealed that two tested insecticides affected the radial growth of fungi partially at all the three concentrations (0.5RC, RC and 1.5RC). At recommended concentration (RC), dinotefuran 20 SG @0.4 g/l was found to be slightly harmful to all three fungi (20% - 35% reduction of the growth of the fungus) and thiamethoxam 25 SG @ 0.25g/l appeared to be slightly harmful to B. bassiana and M. anisopliae and moderately harmful to L. lecanii (35-50% reduction of the growth of the fungus). Thiamethoxam 25SG alone recorded 65.0% mortality of BPH and when mixed with B. bassiana and M. anisopliae gave 86.25% and 81.25% mortality of BPH respectively under glass house conditions. Similarly, Dinotefuron 20 SG alone could gave 98.75% mortality of BPH. 

Efficacy of Entomopathogenic Fungi Against Brown Planthopper Nilaparvata Lugens (Stål) (Homoptera: Delphacidae) Under Controlled Conditions

2019 ◽  
Vol 72 (2) ◽  
pp. 101-112 ◽  
Author(s):  
Bilal Atta ◽  
Muhammad Rizwan ◽  
Arshed Makhdoom Sabir ◽  
Muhammad Dildar Gogi ◽  
Muhammad Asif Farooq ◽  
...  
Keyword(s):  
Entomopathogenic Fungi ◽  
Brown Planthopper ◽  
Nilaparvata Lugens ◽  
Controlled Conditions ◽  
Nilaparvata Lugens Stål

scholarly journals Seasonal variation in population and biochemical contents of brown planthopper, Nilaparvata lugens (Stål)

2022 ◽  
Vol 43 (1) ◽  
pp. 52-58
Author(s):  
S. Narayana ◽  
◽  
S. Chander ◽  
S. Doddachowdappa ◽  
S. Sabtharishi ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Rainy Season ◽  
Brown Planthopper ◽  
Chemical Compounds ◽  
Nilaparvata Lugens ◽  
Water Soluble ◽  
Soluble Carbohydrates ◽  
Water Soluble Carbohydrates ◽  
Nilaparvata Lugens Stål ◽  
Brown Plant Hopper

Aim: The present study was undertaken on population dynamics and estimation of protein, water-soluble carbohydrates and glycogen contents in the brown planthopper, Nilaparvata lugens to explore their migratory behaviour. Methodology: Brown planthopper populations were monitored and collected using sweep nets from 23rd standard meteorological week (SMW) to 47th SMW during 2017 and 2018 rainy seasons to understand population dynamics of the pest. The protein, water-soluble carbohydrates and glycogen contents were estimated from the pest samples collected during 36th to 44th SMW in 2017 and 2018 rainy seasons. Results: Brown planthopper population were not observed in rice farm during 23rd SMW to 28th SMW during two years of study. However, macropterous form of the pest first appeared in the farm during 29th SMW and peaked during 43rd SMW. Thereafter, population declined and disappeared after 47th SMW during both the years. Water-soluble carbohydrates and glycogen contents varied significantly different weeks which remained low during 36th-39th SMW, however, increased gradually towards the end of the rainy season 2017 and 2018. On the other hand, protein content significantly varied among different weeks unlike the trend of water-soluble carbohydrates and glycogen. Interpretation: The study revealed the absence of brown plant hopper during summer season preceding rainy season, and the accumulation of bio-chemical compounds towards the end of rainy season under Delhi environment is perhaps suggestive of migration of the pest from unknown areas during rainy season to Delhi and likely preparedness of the pest for emigration to safer areas from Delhi, respectively.

scholarly journals Determination of brown planthopper resistant genes in some rice varieties by molecular markers

2016 ◽  
Vol 14 (2) ◽  
pp. 261-269
Author(s):  
Nguyễn Thị Kim Liên ◽  
Nguyễn Huy Hoàng ◽  
Lê Bắc Việt ◽  
Phan Thị Bích Thu ◽  
Nguyễn Huy Chung
Keyword(s):  
Molecular Markers ◽  
Resistance Genes ◽  
Brown Planthopper ◽  
Nilaparvata Lugens ◽  
Rice Varieties ◽  
Genomic Platform ◽  
The One ◽  
Nilaparvata Lugens Stål ◽  
Brown Plant Hopper

Brown plant hopper (Nilaparvata lugens Stal.) is the one of dangerous pests for rice that were reported in most of rice growing countries. Twenty seven BPH resistance genes have been detected in cultivated and wild rice. However, each resistance gene is able to resist with only strain or certain biotype. Besides, many studies indicated that the toxicity of BPH strains tend to change and loss the resistance of rice lines. The breeding of rice varieties that resist to many BPH biotypes is being the breeders towards. With helping of the development of molecular markers and genetic engineering, the breeders are hopping to identify the molecular markers that linked tightly with BPH resistance genes and develop the rice varieties can gather many resistance genes in a well genomic platform. In this study, we assessed the resistance of rice lines of Vietnam and imported rice lines. The resistance was ditermined by using assessement method in the galvanized box and molecular markers linkage with resistance genes (Bph1, bph2, Bph3, Bph9 and Bph17). The results showed that there was a high affinity between the two methods with 70.59% and 86.27% of lines that have the resistance (respectively). Among of 51 surveyed rice lines, 44 lines (86.27%) were determined to have at least one marker linkage with resistance genes. 19 lines (37.25%) harbored two or three markers linkage with resistance genes. These lines will be a good genetic resource for screening and breeding the resistant rice varieties.

scholarly journals PATOGENISITAS Beauveria bassiana STRAIN STGD 7(14)2 DAN STGD 5(14)2 TERHADAP WERENG COKLAT (Nilaparvata lugens STÅL)

2018 ◽  
Vol 11 (2) ◽  
pp. 122-132
Author(s):  
Yadi Suryadi ◽  
Wartono Wartono ◽  
Dwi Ningsih Susilowati ◽  
Puji Lestari ◽  
Cyntia Nirmalasari ◽  
...  
Keyword(s):  
Beauveria Bassiana ◽  
Entomopathogenic Fungi ◽  
Internal Transcribed Spacer ◽  
Insect Pests ◽  
Brown Planthopper ◽  
Nilaparvata Lugens ◽  
Its Rdna ◽  
Stink Bug ◽  
West Java ◽  
Nilaparvata Lugens Stål

AbstrakBeauveria spp. merupakan salah satu jamur entomopatogen yang dapat digunakan sebagai agen biokontrol terhadap berbagai serangga hama. Tujuan penelitian ini adalah untuk menguji patogenitas Beauveria spp. terhadap serangga wereng coklat (Nilaparvata lugens Stål). Isolat-isolat Beauveria spp. diisolasi dari serangga walang sangit dari Situ Gede, Bogor, Jawa Barat. Identifikasi jamur dilakukan berdasarkan analisis data sekuen dari daerah Internal Transcribed Spacer (ITS) rDNA. Hasil uji menunjukkan bahwa patogenisitas isolat Stgd 5(14)2 dan Stgd 7(14)2 menghasilkan tingkat mortalitas 100% terhadap N. lugens. Isolat Stgd 5(14)2 dan Stgd 7(14)2 memiliki nilai LT50 yang rendah, danmenyebabkan kematian yang cepat terhadap wereng coklat. Hasil analisis filogenetik menunjukkan bahwa sekuen Stgd 5(14)2 dan Stgd 7(14)2 termasuk ke dalam spesies Beauveria bassiana s.str. Hasil studi ini merupakan kajian awal terhadap patogenisitas jamur entomopatogen B. bassiana terhadap wereng coklat, dan distribusinya di pertanaman padi Situ Gede, Jawa Barat.Abstract Beauveria spp. is one of the entomopathogenic fungi that can be used as biocontrol agents against various insect pests, including brown planthopper (Nilaparvata lugens Stal). This study aimed to test the pathogenicity of Beauveria spp. against N. lugens. Beauveria spp. were isolated from the rice stink bug insects, collected from Situ Gede, Bogor, West Java. Fungal identification was carried out based on the internal transcribed spacer (ITS) rDNA analysis. The pathogenicity assay revealed that Stgd 5(14)1 and Stgd 7(14)2 isolates were virulent against N. lugens, with a mortality of 100%. The LT50 (median lethal time) determination, indicated that Stgd 5(14)2  and Stgd 7(14)2 isolates had low value indicating a faster mortality in brown planthopper insects. Phylogenetic analysis showed that the sequences of Stgd 5(14)2 and Stgd 7(14)2 belong to Beauveria bassiana s.str. This is the preliminary pathogenicity trial of entomopathogenic fungi B. bassiana against brown planthopper and their distribution in rice-growing, Situ Gede area in West Java.

scholarly journals Heat Stress Impedes Development and Lowers Fecundity of the Brown Planthopper Nilaparvata lugens (Stål)

PLoS ONE ◽  
2012 ◽  
Vol 7 (10) ◽  
pp. e47413 ◽  
Author(s):  
Jiranan Piyaphongkul ◽  
Jeremy Pritchard ◽  
Jeff Bale
Keyword(s):  
Heat Stress ◽  
Brown Planthopper ◽  
Nilaparvata Lugens ◽  
Nilaparvata Lugens Stål

RNA interference-aided knockdown of a putative saccharopine dehydrogenase leads to abnormal ecdysis in the brown planthopper, Nilaparvata lugens (Stål) (Hemiptera: Delphacidae)

2015 ◽  
Vol 105 (4) ◽  
pp. 390-398 ◽  
Author(s):  
P.-J. Wan ◽  
L. Yang ◽  
S.-Y. Yuan ◽  
Y.-H. Tang ◽  
Q. Fu ◽  
...  
Keyword(s):  
Brown Planthopper ◽  
Transcript Level ◽  
Nilaparvata Lugens ◽  
The Body ◽  
Double Stranded Rna ◽  
Saccharopine Dehydrogenase ◽  
Body Weights ◽  
Nilaparvata Lugens Stål ◽  
Phloem Feeding ◽  
Wing Deformation

AbstractThe brown planthopper Nilaparvata lugens is a serious phloem-feeding pest of rice in China. The current study focuses on a saccharopine dehydrogenase (SDH) that catalyzes the penultimate reaction in biosynthesis of the amino acid lysine (Lys), which plays a role in insect growth and carnitine production (as a substrate). The protein, provisionally designated as NlylsSDH [a SDH derived from yeast-like symbiont (YLS) in N. lugens], had a higher transcript level in abdomens, compared with heads, wings, legs and thoraces, which agrees with YLS distribution in N. lugens. Ingestion of Nlylssdh targeted double-stranded RNA (dsNlylssdh) for 5, 10 and 15 days decreased the mRNA abundance in the hoppers by 47, 70 and 31%, respectively, comparing with those ingesting normal or dsegfp diets. Nlylssdh knockdown slightly decreased the body weights, significantly delayed the development of females, and killed approximately 30% of the nymphs. Moreover, some surviving adults showed two apparent phenotypic defects: wing deformation and nymphal cuticles remained on tips of the legs and abdomens. The brachypterours/macropterours and sex ratios (female/male) of the adults on the dsRNA diet were lowered compared with the adults on diets without dsRNA. These results suggest that Nlylssdh encodes a functional SDH protein. The adverse effect of Nlylssdh knockdown on N. lugens implies the importance of Lys in hopper development. This study provides a proof of concept example that Nlylssdh could serve as a possible dsRNA-based pesticide for planthopper control.

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