The toxicity of the most commonly used insecticides of organochlorine, organophosphate, pyrethroid, and carbamate groups were investigated against Spodoptera litura (F.) (Lepidoptera: Noctuidae) populations collected for three consecutive years (2004-2006). For a chlorocyclodiene and pyrethroids tested, the resistance ratios compared with Lab-PK were in the range of 10- to 92-fold for endosulfan, 5- to 111-fold for cypermethrin, 2- to 98-fold for deltamethrin, and 7- to 86-fold for beta-cyfluthrin. For organophosphates and carbamates, resistance ratios were in the range of 3- to 169-fold for profenofos, 18- to 421-fold for chlorpyrifos, 3- to 160-fold for quinalphos, 6- to 126-fold for phoxim, 7- to 463-fold for triazophos, and 10- to 389-fold for methomyl and 16- to 200-fold for thiodicarb. Resistance ratios were generally low to medium for deltamethrin and beta-cyfluthrin and high to very high for endosulfan, cypermethrin, profenofos, chlorpyrifos, quinalphos, phoxim, triazophos, methomyl, or thiodicarb. Pairwise comparisons of the log LC50 values of insecticides tested for all the populations showed correlations among several insecticides, suggesting a cross-resistance mechanism. Integration of timely judgment of pest problem, delimiting growing of alternate crops such as arum, rotation of insecticides with new chemicals, and insect growth regulators in relation to integrated pest management could help in manageable control of this important pest.
The economic loss due to pest attack in stored commodities is a serious problem worldwide. About 200 insect species attack stored commodities. These insect pests are responsible for quantitative and qualitative losses in cereal grains. Among the stored grain pests, Angoumois grain moth, Sitotroga cerealella is considered as common, top of the list and most destructive pest of cereal grains. Its infestation starts in the standing crop and continues in storage. Although there are many control strategies, our need is some effective, cheap and readily available strategy for safe storage. This review presents different ways by which S. cerealella can be controlled. In this paper, a list of approaches is given which are used to improve the protection of stored grains against S. cerealella attack. These approaches include use of edible oils, containers, synthetic chemicals, agricultural waste materials, plant derivatives, bacterial protoxins, biopesticides, biocontrol enhancers and semiochemicals. If these tactics are followed as combined strategies in a compatible manner, they can provide us an integrated pest management programme for the efficient control of S. cerealella in cereal grains.
Maize flour was infested with fresh emerged Tribolium castaneum adults, and its nutritional composition was evaluated after 0, 45, and 90 days of the infestation. Furthermore, 99% carbon dioxide was applied to different developmental stages of T. castaneum for its management. There were six treatments and five replicates; for each replicate, maize flour (150 g) was taken in a 250-ml plastic jar container, insects were released in the flour, and jars were placed into the incubator at a temperature of 28 ± 1 °C, 60 ± 5% RH. Similarly, the application of 99% CO was done with four exposure times of 12, 24, 48, and 72 h, at 35 °C 65 ± 5% RH. Present results showed major fluctuations in the nutritive composition of maize flour. Increase in the moisture, fat, fiber, protein, and ash contents was directly proportional to the increase in infestation level and time, contrary to the depletion of carbohydrates and total weight loss. The results of CO treatment indicated that pupa was the most resilient stage as compared with larvae and adult stage. The observed susceptibility order was as follows: adult > larvae > pupae. The maximum mortality of adult, larval, and pupal stages was recorded after 24, 48, and 72 h of CO application, respectively. These findings might be helpful to develop an ecofriendly technique to manage this crucial pest.
Post-harvest losses caused by stored product pests are posing serious threats to global food security and safety. Among the storage pests, psocids were ignored in the past due to unavailability of the significant evidence regarding quantitative and qualitative losses caused by them. Their economic importance has been recognized by many researchers around the globe since the last few years. The published reports suggest that the pest be recognized as a new risk for global food security and safety. Psocids have been found infesting stored grains in the USA, Australia, UK, Brazil, Indonesia, China, India and Pakistan. About sixteen species of psocids have been identified and listed as pests of stored grains. Psocids generally prefer infested kernels having some fungal growth, but are capable of excavating the soft endosperm of damaged or cracked uninfected grains. Economic losses due to their feeding are directly proportional to the intensity of infestation and their population. The pest has also been reported to cause health problems in humans. Keeping the economic importance of psocids in view, their phylogeny, distribution, bio-ecology, management and pest status have been reviewed in this paper.
Petroleum ether, acetone and ethanol extracts of neem, sweet flag, and turmeric were evaluated for their growth inhibiting effects on the Tribolium castaneum at the application rate of 1000, 500, 250 and 125 μg/g food media. Petroleum ether extracts showed the lowest number of larvae produced (34.00) in 1000 µg/g neem extract. Acetone extract of sweet flag showed minimum and significantly lower number of larvae produced (8.00) at 1000 µg/g, whereas ethanol extracts of turmeric showed minimum numbers of larvae (106.30) at 1000 µg/g application rate. Maximum inhibition ratio of pupation was found as 81.18 % at 1000 µg/g dosage of petroleum ether extract of sweet flag resulting into 8.75 pupae. Acetone extract of sweet flag showed minimum numbers of pupae produced (8.00) at 1000 µg/g of sweet flag, whereas ethanol extract of sweet flag showed minimum numbers of pupae (41.75) at 1000 µg/g. Petroleum ether extract of sweet flag showed a maximum inhibition ratio (40.00 %) resulting into 5.25 adults produced at 1000 µg/g. Acetone extract of sweet flag showed the lowest numbers of adults produced (8.00) at 1000 µg/g. Ethanol extract of neem showed lower numbers of adults (35.25) at 1000 µg/g dosage, followed by 38.50 in sweet flag and 52.75 in turmeric at the same application rate.
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