Defensive secretion of rice bug,Leptocorisa oratorius fabricius, (Hemiptera: Coreidae): A unique chemical combination and its toxic, repellent, and alarm properties

1993 ◽  
Vol 19 (4) ◽  
pp. 851-861 ◽  
Author(s):  
Neelakanthi E. Gunawardena ◽  
M. K. Bandumathie
Keyword(s):  
Defensive Secretion ◽  
Chemical Combination ◽  
Rice Bug ◽  
Leptocorisa Oratorius ◽  
Unique Chemical

scholarly journals The Species of Rice Bug (Leptocorisa oratorius Fabricius) Egg Parasitoids in Rice Field in West Sumatera, Indonesia

2020 ◽  
Vol 4 (1) ◽  
pp. 76-85
Author(s):  
Fri Maulina ◽  
Novri Nelly ◽  
Hidrayani Hidrayani ◽  
Hasmiandy Hamid
Keyword(s):  
Random Sampling ◽  
Rice Field ◽  
Diversity Index ◽  
Egg Parasitoid ◽  
Sampling Location ◽  
Transect Line ◽  
Sampling Locations ◽  
West Sumatra ◽  
Rice Bug ◽  
Leptocorisa Oratorius

The species of egg parasitoid in rice bug is necessary to know to be used as biological agent in the field. The research aimed to determine spesies of parasitoid, diversity index, parasitization level and parasitoid mortality which found in rice bug eggs in rice fields in West Sumatra. Purposive random sampling was used in this research for determining the sampling locations. Collecting eggs sampling was conducted for 1 km along transect line in sampling location. The collected eggs of 12 sampling locations then observed and identified in Laboratory of Insect Bioecology, Faculty of Agriculture, Andalas University. The result showed that the kind of egg parasitoid  found in the field were Hadronotus leptocorisae  and  Ooencyrtus malayensis with each parasitization level were 22.3 ± 11.1 %  and 4.2 ± 5.3 %, each the mortality were 57.8 ± 26.4% and 30.6 ± 37%, the diversity of egg parasitoid was low with the index 0.3858 Based on Shannon-Wienner.

scholarly journals The Effect of Rice Bug Population (Leptocorisa oratorius Fabricius) on Paddy Yield in Kimak Village, Merawang District, Bangka Regency

2018 ◽  
Vol 2 (1) ◽  
pp. 6-14
Author(s):  
Winarsi Winarsi ◽  
Sitti Nurul Aini ◽  
Rion Apriyadi
Keyword(s):  
Experimental Method ◽  
Paddy Field ◽  
Yield Loss ◽  
Rice Yield ◽  
Staple Food ◽  
Randomized Design ◽  
Rice Bug ◽  
Completely Randomized Design ◽  
Leptocorisa Oratorius ◽  
Paddy Yield

Rice crops are the main source of staple food for the Indonesian people, as well as in the Bangka Belitung province. The cultivation of rice crops is still through various obstacles, such as the attack of Leptocorisa oratorius Fabricius, which attacks the rice plants after flowering by sucking the grain. The aim of this study was to know the effect of L.oratorius population on the rice yield, to know the number of L. oratorius  that can decrease  the 15% paddy yield and to know the percentage of rice loss based on the number of L. oratorius population in the Kimak village, Merawang district, Bangka regency. The research was conducted on November 2017 to January 2018 on paddy field in Kimak village. This research used experimental method with Completely Randomized Design (CRD) wich consist of 8 treatments and 2 replications. The treatment was the differences L.oratorius population. Consist of: without L.oratorius, 2 L.oratorius, 3 L.oratorius, 4 L.oratorius,  5 L.oratorius, 6 L.oratorius, 7 L.oratorius and 8 L.oratorius. The result showed that the number of L. oratorius has significant effect on rice yield, 3 population of L. oratorius per 50 cm x 50 cm able to reduce the rice yield by 15% and the percentage of yield loss at the treatment of 2 - 8 L.oratorius is about 10.97% up to 28.98%.

Effect of Rice Bug Leptocorisa oratorius (Hemiptera: Alydidae) on Rice Yield, Grain Quality, and Seed Viability

2004 ◽  
Vol 97 (6) ◽  
pp. 1923-1927 ◽  
Author(s):  
Gary C. Jahn ◽  
Isaias Domingo ◽  
M. Liberty ◽  
P. Almazan ◽  
Jocelyn Pacia
Keyword(s):  
Grain Quality ◽  
Rice Yield ◽  
Seed Viability ◽  
Rice Bug ◽  
Leptocorisa Oratorius

scholarly journals High Potential of Liquid Smoke from Coconut Shell (Cocos nucifera) for Biological Control of Rice Bug (Leptocorisa oratorius Fabricius)

2021 ◽  
Vol 11 (1) ◽  
pp. 85-91
Author(s):  
Zulfaidah Gama ◽  
◽  
Rizky Purnama ◽  
Dewi Melani ◽  
◽  
...  
Keyword(s):  
Cocos Nucifera ◽  
Coconut Shell ◽  
Antifeedant Activity ◽  
Liquid Smoke ◽  
Low Concentrations ◽  
Rice Bug ◽  
High Concentrations ◽  
One Way Anova ◽  
Leptocorisa Oratorius ◽  
Local Farmers

Rice bug (Leptocorisa oracorius F) is one of the most dangerous pests for paddy commodities (Oryza sativa) in the world. The use of liquid smoke was popular among local farmers to control rice bug. A coconut shell is the main source for making liquid smoke. This research aims to analyse rice bugs' mortality and antifeedant activity when dipped with coconut shell liquid smoke. The liquid smoke's effectiveness was measured by dipping paddy (5 grams in weight) that is previously soaked with coconut shell liquid for 20 seconds. The liquid smoke was prepared in various concentrations, ranging from 0% as a control; 0.50%; 0.75%; 1%; 1.25% and 1,50%. Observations were made at 24, 48, 72, 96, 120, 144 and 168 hours. Data analysis was performed by one-way ANOVA test, using SPSS program followed by a 0.05 Tukey test to determine the significance of the rice bug pest mortality. The study resulted that the mortality values from low concentrations to high concentrations were 40%, 46.67%, 60%, 70%, and 80% over seven days. The antifeedant percentage of liquid smoke increased from low concentrations to high concentrations respectively were 10.14%, 15.15%, 31.03%, 46.15%, and 68.88% during seven days. The concentration of liquid smoke that has the highest mortality was 1.50%. In conclusion, 1.50% of liquid smoke showed the highest percentage of mortality and antifeedant activity with 80% and 68.88%, respectively. In the future, it is hoped to develop this model for commercial consumption and reduce reliance on chemicals to control rice bugs. The use of pesticides can do more harm than good, especially to the environmental system

scholarly journals KETERTARIKAN WALANG SANGIT (Leptocorisa oratorius F.) TERHADAP BEBERAPA BAHAN ORGANIK YANG MEMBUSUK

2001 ◽  
Vol 1 (1) ◽  
pp. 16-24
Author(s):  
Solikhin Solikhin
Keyword(s):  
Gas Chromatography ◽  
Volatile Compounds ◽  
Adult Male ◽  
Block Design ◽  
Preference Test ◽  
Stink Bug ◽  
Stink Bugs ◽  
Rice Bug ◽  
Leptocorisa Oratorius ◽  
Rice Stink Bug

Attractiveness of Rice Bug (Leptocorisa oratorius F.) to Several Faunal Decaying Materials. An experiment was conducted in Yogyakarta from October 1996 to September 1997 to know (1) the attractiveness of adult male versus female rice stink bug in to decaying crab, (2) the attractiveness of the rice stink bug from the result of point-1 to five decaying materials, and (3) the volatile compounds emitted by each decaying material.  For the first objective, 50 rice stink bugs (sex ratio 1:1) were released into a preference test cage for one hour. Data was then analyzed with X2 at 1 and 5%.  For the second objective, five replicates of five different treatments were arranged in randomized completely block design.  As many as 125 rice stink bugs were released into the central part of  the cage consisting of five equal parts of attractants for one hour.  Data of rice stink bug from each part was analyzed with Anova continued with Duncan's Test at 1 and 5%..  Volatile compounds emitted by each material were captured based on the method of Gamliel and Stapleton (1993) then identified with gas chromatography mass spectrophotometry (GC-MS) and (or) capillary gas chromatography. The results were that: (1) adult male rice bug was significantly more attracted to that of female in response to sixth-day-decaying-crab, (2) adult male rice bug was most attracted to sixth-day-decaying cow blood compared to four others, and (3) volatile compounds emitted by those five materials were carbon dioxide, methanol, ethanol, aceton, dimethyl sulphide, dimethyl disulphide, ammonia, acetic acid, and an unidentified compound.

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