Residual efficacy of spinosad and spinetoram on traditional and new improved rice varieties on the mortality of Rhyzopertha dominica (F.) (Coleoptera: Bostrychidae)

2020 ◽  
Vol 88 ◽  
pp. 101643
Author(s):  
D.M.S.K. Dissanayaka ◽  
A.M.P. Sammani ◽  
L.K.W. Wijayaratne
Keyword(s):  
Rhyzopertha Dominica ◽  
Rice Varieties ◽  
Residual Efficacy

Resistance levels of selected rice genotypes to Sitophilus oryzae L. and Rhyzopertha dominica F. infestations

2020 ◽  
Vol 17 ◽  
pp. 39-46
Author(s):  
S.K. Ajao ◽  
K.O. Popoola ◽  
S Mande ◽  
A Togola
Keyword(s):  
Insect Pests ◽  
Sitophilus Oryzae ◽  
Rhyzopertha Dominica ◽  
International Institute ◽  
Rice Varieties ◽  
Resistance Level ◽  
Susceptibility Index ◽  
Grain Damage ◽  
Rice Genotypes ◽  
Moderately Resistant

The need to screen new rice genotypes for resistance to stored product insect pests is important to boost production and availability of rice for food security. Therefore, thirteen rice genotypes and varieties included ten interspecific rice genotypes from two crossed parents Oryza sativa (WAB 56-104) and Oryza barthii (IRGC 106107), the two parents and NERICA8 variety were collected from Africa Rice Center, International Institute of Tropical Agriculture (IITA) Ibadan, to examine their resistance level to infestation by Sitophilus oryzae L. and Rhyzopertha dominica F. The resistance of the varieties were assessed by artificial infestation with 12 unsexed adults each in 10 g of the rice varieties in four replicates under laboratory conditions of 26 ± 2oC temperature and 75 ± 5% relative humidity in a completely randomized design. Number of adult insect emergent, per cent grain damage, percent weight loss of infested samples and index of susceptibility were determined. Correlation analysis between nutritional contents of the varieties and infestation variables were also obtained. Results indicate differential responses of the two insects on the rice genotypes/varieties. The O. barthii parent was resistant, while the O. sativa parent was moderately resistant using the susceptibility index. Of the ten rice genotypes, G4, G3, G1, G7, G2, G10 and G9 were resistant in descending order, while G5 and G6 were moderately resistant, whereas only G8 was susceptible. NERICA8 was also found to be susceptible to infestation. In addition, the resistant grains had lower ash content. Modification in genetic variations and nutritional contents of new rice varieties may be a critical factor in insect resistant genotype pro-grammes to reduce post-harvest losses incurred by farmers. Keywords: Rice resistant genotypes; Rhyzopertha dominica; Oryzae sativa; Oryzae barthii; Sitophilus oryzae; susceptibility index

scholarly journals Residual efficacy of Deltamethrin against Sitophilus oryzae (L.), Rhyzopertha dominica (F.), Tribolium castaneum (Herbst) and Sitotroga cerealella (Oliv.) in wheat grain

2018 ◽  
Vol 33 (2) ◽  
pp. 127-135 ◽  
Author(s):  
Marijana Prazic-Golic ◽  
Petar Kljajic ◽  
Goran Andric ◽  
Nenad Tamas ◽  
Stefan Prazic
Keyword(s):  
Tribolium Castaneum ◽  
Recovery Period ◽  
Sitophilus Oryzae ◽  
Adult Mortality ◽  
Rhyzopertha Dominica ◽  
Sitotroga Cerealella ◽  
Wheat Grain ◽  
Before And After ◽  
Residual Efficacy ◽  
Residual Control

Residual efficacy of the insecticide deltamethrin, an EC formulation containing 25 g/L AI + 225 g/L PBO (piperonyl butoxide synergist), against lab populations of Sitophilus oryzae, Rhyzopertha dominica, Tribolium castaneum and Sitotroga cerealella was investigated in the laboratory by applying product water solutions (0.25 mg AI/kg) to wheat grain (at 25?1?C and 60?5% r.h.). Adult mortality on 0, 7, 14 and 30 days old deposits was estimated after 2, 7 and 14 days of exposure to treated wheat grain and additional 7 days of recovery. Progeny reduction (PR, %) was also assessed. After 2 days of exposure to deposits of all ages, deltamethrin caused only 0-10% mortality of coleopterans (up to 37% after the recovery period) and 23-30% of S. cerealella, while mortality before and after recovery from 14 days of exposure was 95-50% for S. oryzae, 97-100% for R. dominica, 99-100% for T. castaneum and 100% for S. cerealella. Progeny production of S. oryzae was highest after parents contacted with 14 days old deposit of deltamethrin (PR, 76%), and lowest after contact with fresh deposit (PR, 95%), while R. dominica and T. castaneum had no progeny on any deltamethrin deposit age in wheat (PR, 100%), and S. cerealella had only a very low progeny (PR, 99%). The results showed that the synergised deltamethrin, applied at 0.25 mg/kg in wheat grain, is a highly effective insecticide for storedproduct insect control, while a higher dose is required for successful residual control of S. oryzae.

Residual efficacy of spinetoram on wheat and maize against Rhyzopertha dominica and Sitophilus oryzae

2022 ◽  
Vol 95 ◽  
pp. 101900
Author(s):  
T. Ksoura ◽  
P. Agrafioti ◽  
N.G. Tsiropoulos ◽  
C.G. Athanassiou
Keyword(s):  
Sitophilus Oryzae ◽  
Rhyzopertha Dominica ◽  
Residual Efficacy

scholarly journals Susceptibility of Milled Rice Varieties to the Lesser Grain Borer (Rhyzopertha dominica, F)

2013 ◽  
Vol 5 (2) ◽  
Author(s):  
L. P. Astuti ◽  
G. Mudjiono ◽  
S. Rasminah Ch. ◽  
B. T. Rahardjo
Keyword(s):  
Rhyzopertha Dominica ◽  
Milled Rice ◽  
Rice Varieties ◽  
Lesser Grain Borer

scholarly journals Residual Efficacy of a Deltamethrin Emulsifiable Concentrate Formulation against Rhyzopertha dominica (F.) and Sitotroga cerealella (Oliver) after Partial Treatment of Brown Rice

Insects ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 95 ◽  
Author(s):  
Frank Arthur
Keyword(s):  
Weight Loss ◽  
Brown Rice ◽  
Rhyzopertha Dominica ◽  
Sitotroga Cerealella ◽  
Feeding Damage ◽  
Progeny Production ◽  
Lesser Grain Borer ◽  
Emulsifiable Concentrate ◽  
Angoumois Grain Moth ◽  
Residual Efficacy

Rhyzopertha dominica (Fab.), the lesser grain borer, and Sitotroga cerealella (Olivier), the Angoumois grain moth, are internally feeding stored product insects that can infest raw grains. In this test, brown rice was treated with 0.5 and 1.0 ppm of a new emulsifiable concentrate (EC) formulation of the pyrethroid deltamethrin and stored for 12 months. One day after treatment, and every 3 months for 12 months, treated rice was mixed with untreated brown rice in the following ratios: 0:100 (untreated controls), 10:90, 25:75, 50:50, 75:25, and 100:0 (all treated). Bioassays were conducted by exposing 10 parental adults of each species on the rice mixtures and assessing progeny production, feeding damage, and weight loss. The progeny of S. cerealella ranged from 105.6 F1 adults on untreated brown rice to 69.4 F1 adults on 100% treated rice, but there was little feeding damage or weight loss. The progeny production of R. dominica declined from 177.4 F1 adults on untreated rice to 9.8 F1 adults on 100% treated rice. Weight loss and feeding damage were correlated with progeny production. The results show that the new deltamethrin formulation could be used for protection of brown rice, but S. cerealella may be less susceptible to deltamethrin compared to R. dominica.

scholarly journals Susceptibility of some Rice Varieties to the Lesser Grain Borer, Rhyzopertha dominica Fab. (Coleoptera: Bostrichidae) in Benin

2012 ◽  
Vol 13 (1) ◽  
pp. 173-177 ◽  
Author(s):  
D.C. Chougourou ◽  
A. Togola ◽  
F.E. Nwilene ◽  
J. Adeliossi ◽  
F. Bachabi ◽  
...  
Keyword(s):  
Rhyzopertha Dominica ◽  
Rice Varieties ◽  
Lesser Grain Borer

scholarly journals The Physical and Biochemical Characteristics of Resistance in Different Rice Varieties and Initial Moisture Content for Their Susceptibility to Rhyzopertha dominica F. (Coleoptera: Bostrichidae)

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Ludji Pantja ASTUTI ◽  
Gatot MUDJIONO ◽  
Siti Ch. RASMINAH ◽  
Bambang Tri RAHARDJO
Keyword(s):  
Weight Loss ◽  
Moisture Content ◽  
Free Choice ◽  
Initial Moisture Content ◽  
Developmental Time ◽  
Rhyzopertha Dominica ◽  
Choice Test ◽  
Rice Varieties ◽  
Biochemical Characteristics ◽  
Choice Tests

Rhyzopertha dominica reduces the weight of rice production at approximately 40 %. This study aimed to investigate the physical and biochemical characteristics of resistance in different rice varieties at different initial moisture content to their susceptibility against R. dominica. The study consisted of 2 experiments: (i) free-choice, and (ii) no-choice tests. These experiments were conducted by combining 6 rice varieties (Vi): IR-64, Ciherang, Membramo, Cibogo, Sembada, and, Intani-2, and 4 levels of initial moisture content (Ki): 10, 12, 14, and 16 %. The observed variables for the free-choice test were the number of adult insects (male and female) present, the number of females present, and the percentage of weight loss. The observed variables for the no-choice test were the number of eggs, larvae, F1 progeny emerged, and the median developmental time of R. dominica. Results of the free-choice test revealed that the highest total number of adult insects present, the female insects present, and the percentage of weight loss appeared in the Intani-2 variety at 16 % initial moisture content, while the lowest of these 3 variables appeared in the Membramo variety at 10 % initial moisture content. The no-choice test revealed that the rice varieties became more susceptible with the increase of the initial moisture content. The susceptibility of rice was affected by hardness, ash content, and phenol content. Rice hardness level were caused by the level of initial moisture content. However, the chemical characteristics of the rice were not affected by the level of initial moisture content.

scholarly journals Methodology for Assessing Rice Varieties for Resistance to the Lesser Grain Borer,Rhyzopertha dominica

2008 ◽  
Vol 8 (16) ◽  
pp. 1-5 ◽  
Author(s):  
Y Chanbang ◽  
F. H Arthur ◽  
G. E Wilde ◽  
J. E Throne ◽  
B. H Subramanyam
Keyword(s):  
Rhyzopertha Dominica ◽  
Rice Varieties ◽  
Lesser Grain Borer
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