• Title, Summary, Keyword: insecticides

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A Study on the molluscicidal effect of the insecticides upon Parafossarulus manchouricus (쇠우렁에 대한 살충제의 살패작용에 관한 조사)

  • 구성회;김창환
    • Journal of Environmental Health Sciences
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    • v.6 no.1
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    • pp.10-21
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    • 1979
  • In preventing the infection of Clonorchis sinensis, there is one way in which life cycle of Clonorchis sinensis is cut off by eradicating the first intermediate host viz Parafossarulus manchuoricus, with molluscicides or insecticides. This survey was carried out in order to evaluating the molluscicidal effect of several insecticides upon P. manchauricus. In this survey, diazinon, heptachlor, E.P.N., E.M., and malathion was applied as molluscidies. Those insecticides had been generaly used in farming area. The results are summarized as follows. 1) In molluscicidal effect, E.M. showed the higher molluscicidal effect than any other insecticides in all experiment parts, and the order of insecticides upon molluscicidal effect was that of E.M., E.P.N., heptachlor and malathion. 2) $LD_{50}$ values are varied according to the exposure time in insecticide solution, and the longer the exposure time is, the lower the values of $LD_{50}$ is. 3) To take the exposure time in low concentration of insecticide solution for the long time would obtain the more molluscicidal effect. 4) The mortality rate increases in proportion as the concentration of insecticides increases.

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Susceptibility of the Predatory Mite, Phytoseiulus persimilis (Acari: Phytoseiidae) to Several Insecticides (칠레이리응애의 살충제에 대한 감수성)

  • Kim, Moo Sung;Kim, Sang Soo
    • The Korean Journal of Pesticide Science
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    • v.20 no.1
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    • pp.66-71
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    • 2016
  • Susceptibility of the predatory mite, Phytoseiulus persimilis to 8 insecticides was evaluated. In treatments with insecticides tested, 78-92% of adult female predators survived after 168 hrs after treatment. Adult female predators treated with insecticides tested produced 62.6-93.4% as many eggs as did control females and eclosion of eggs deposited by treated predators was not affected. Moreover, hatch percentage of P. persimilis eggs and survival of nymphs were not seriously affected by exposure to the insecticides tested. Immatures of P. persimilis survived on the leaf disc treated with insecticides tested and 98-100% of immature predators reached adulthood. Based on the results, insecticides tested are expected to be promising candidates for use in integrated pest management program with P. persimilis.

Screening of Insecticides for Control of Spodoptera exigua in Double Cropping after Early Rice Alisma plantago

  • Kwon, Byung-Sun;Shin, Jong-Sup;Park, Hee-Jin
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.46 no.5
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    • pp.345-347
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    • 2001
  • This study was conducted to evaluate the effect of insecticides on control of Spodoptera exigua, growth characteristics, and dry root yield in the cultivation of Alisma plantago after early maturing rice cropping. All pesticides treated had no effect on growth and flowering rate of Alisma plantago. The major insecticides were teflubenzuron Wp, 5%, tebufenozide Wp, 8%, iufenuron Ec, 5%, and tebufenozide Wp, 5%. Dry root yield were increased largely with tebufenozide Wp, 5%(20 g/20 l), insecticide than the other insecticides and no control. All insecticides had no injury with standard dosage. On the other hand, all insecticides had slight injury in the double dosage level for the Alisma plantago.

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A Study on the Degradation Process of Organophosphorus Insecticides depending on Variation of pH in Several Waters (몇 종류의 물에서 pH 변화에 의한 유기인계 살충제의 분해과정에 관한 고찰)

  • 김종향;하대식
    • Journal of Food Hygiene and Safety
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    • v.9 no.4
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    • pp.185-189
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    • 1994
  • This study was to investigate time-dependent degradation process under various pH condition for organophosphorus(org-p) insecticides, namely Demeton-s-methyl, diazinon, Parathion, Phenthoate, and EPN in several waters. They were analysed by GC-FTD according to standard methods for the examination of water and wastewater. In pH=4, diazinon showed disappearance after 14 days in chromatogram. In pH=11, org-p insecticides were almost degradable after 7 days. In this condition, effect of pH on degradation process was greater than of light. In pH=7, org-p insecticides persisted residues after 112 days except Demeton-s-methyl. In BOD5 120, 250 ppm and domestic water, org-p insecticides showed also rapid degradation process.

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Do neonicotinoid insecticides impaired olfactory learning behavior in Apis mellifera?

  • Imran, Muhammad;Sheikh, Umer Ayyaz Aslam;Nasir, Muhammad;Ghaffar, Muhammad Abdul;Tamkeen, Ansa;Iqbal, Muhammad Aamir
    • International Journal of Industrial Entomology
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    • v.38 no.1
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    • pp.1-5
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    • 2019
  • Bee's population is declining and disappearing at alarming rate. There are many factors responsible for declining the population of bees including diseases, natural enemies, environmental conditions and pesticides. Insecticides play its role dramatically for their population decline and neonicotinoid insecticides are critically important due to their wide application for pest control. Keeping in view of above problem, effect of neonicotinoid insecticides on olfactory learning behavior in Apis mellifera was observed using Proboscis Extension Reflex (PER) method. In this method, bees were harnessed in centrifuges tubes and feed on insecticides mixed sugar solution after three hours hunger. Bees were checked by feeding on non-treated sugar solution to observe PER response. Minimum proboscis extension was observed for acetamiprid and imidacloprid with 26% and 20% respectively at their recommend field doses while it was maximum for dinotefuran and thiamethoxam with 73% and 60% respectively. Only 40% bees showed response when exposed at 1/10 concentration of field dose for imidacloprid and the least at 1/100 of field dose. At control (Sugar solution) about 90% bees showed PER response. Among these neonicotinoid insecticides tested, imidacloprid and acetamiprid were the most damaging which impaired the olfactory learning performance in Apis mellifera.

Effects of Insecticides on Enzyme Activities in Soil Environment (살충제(殺蟲劑)가 토양환경중(土壤環境中) 효소활성(酵素活性)에 미치는 영향(影響))

  • Hong, Jong-Uck;Kim, Jang-Eok
    • Applied Biological Chemistry
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    • v.29 no.3
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    • pp.294-303
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    • 1986
  • The effects of insecticides on biochemical precesses in soil were studied by determining the effects of the chemical structure of each insecticides on enzyme activities, pesticide residue and total number of bacteria revealed when soil treated with urea was incubated at $28{\pm}1^{\circ}$ for 56 days. The inhibition effects of insectides on enzyme activites in soil decreased in the order: dithiophosphoric acid > thiophosphhoric acid > phosphoric acid > carbamate insecticides for urease and phosphatase, thiophosphoric acid > dithiophosphoric acid > phosphoric acid > carbamate insecticides for L-glutaminase and protease. The inhibition effects of organophophorus insecticides on enzyme activities in soil were maintained longer than those of carbamate insecticides. Carbamate insecticides increased the activities of protease and L-glutaminase at 56 days. When insecticides were treated in soil together with urea, the degradation of insecticides was accelerated. By treatment of insecticides, the total number of bacteria was decreased at the early stage of treatment but thereafter increased according to phosphoric acid and carbamate insecticides.

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Microbiological Control of Insect Pests (해충의 미생물학적 방제)

  • Kawase Shigemi
    • Korean journal of applied entomology
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    • v.22 no.2
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    • pp.67-73
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    • 1983
  • Despite the great importance of chemical insecticides, with the ever increasing resistance of pest insects to chemical insecticides and the growing concern over environmental pollution, it becomes evident that the problem of pest attack on crops cannot be solved by anyone system. Under these circumstances, main pathogens of insects, i.e., viruses, bacteria, fungi and protozoa, have been studied to control many insect pests. Some of these pathogens are now being produced as microbial insecticides at the rate of hundreds of tons per year in the world. Some microbial insecticides are very effective against numerous or target insects under suitable environmental condition, and microbial control has been played an important role in integrated control program. They have many unique properties such as selectivity, multiplication and harmless to higher animals. However, we must be aware also that there are many problems to be solved, such as safety, persistence and difficulty of efficacy, etc_ on the microbial insecticides.

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Effects of Wood Vinegar Mixted with Insecticides on the Mortalities of Nilaparvata lugens and Laodelphax striatellus(Homoptera: Delphacidae)

  • Kim, Dong-Hun;Seo, Han-Eul;Lee, Sang-Chul;Lee, Kyeong-Yeoll
    • Animal cells and systems
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    • v.12 no.1
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    • pp.47-52
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    • 2008
  • Effects of wood vinegar on the activity of various insecticides were determined by measuring the mortality of two species of rice planthoppers, Nilaparvata lugens and Laodelphax striatellus. Wood vinegar itself did not show insecticidal activity on planthoppers. When the planthoppers were treated with wood vinegar mixed with one of insecticides such as BPMC, dinotefuran, imidacloprid, carbosulfan or insect growth regulators, the planthopper mortality induced by carbosulfan was greatly increased by the wood vinegar in comparison with a single carbosulfan treatment. Wood vinegar showed no effect on other insecticides. In addition, the wood vinegar-carbosulfan mixture significantly reduced AChE activity of planthoppers, which is a target molecule of carbosulfan. This result suggests that wood vinegar has a synergistic effect on the insecticidal activity of carbosulfan. Our study provides information on a potential role of wood vinegar in facilitation of activity of specific insecticides.

Studies on the Susceptibility of Insecticides and Killing Effect by Thermal Fogging Against Culex pipiens pallens of Ansan Strain (안산시 서식 빨간집모기(Culex pipiens pallens)에 대한 살충제 감수성 및 가열연막 효과에 관한 연구)

  • Choi Han-Young
    • Journal of environmental and Sanitary engineering
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    • v.20 no.3
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    • pp.44-50
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    • 2005
  • Studies on the insecticides susceptibility of adults females Culex pipiens pallens were carried out in 2003. The pupae were emerged originated wild-caught larvae in Ansan city, Korea. The test methods employed, using 7 organophosphorous insecticides, four synthetic pyrethroides, and fipronil penyrazole were evaluated. The following results were obtained 1. Fipronil has showed the most strong value in $LD_{50}\;0.00075{\mu}g/female$, out of 12 kind of insecticides, and followed by deltamethrin 0.0071, $\delta-cyhalothrin\;0.008$, profenofos 0.0082 and $\beta-cyfluthrin$ 0.0088, respectively 2. The killing effect of lambdacyhalothrin and profenophos against adult females Culex pipiens pallens was examined using thermal fogging. The mortality rate were lambdacyhalothrin $41.1\%$ and profenophos $50.7\%$, respectively. The killing effect of thermal fogging was highly effectiveness to distance 6m from nozzle

Toxicity Test of Public Health Insecticides Against the Smoky-Brown Cockroach, Periplaneta fuliginosa, Serville in Korea (韓國産 먹바퀴에 대한 防疫用殺蟲劑의 毒性調査)

  • Koo, Sung Hoi;Shim, Jae Chul
    • Journal of Environmental Health Sciences
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    • v.10 no.1
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    • pp.47-54
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    • 1984
  • The toxicity value of 13 kinds of public health insecticides against the adult female cockroach, Periplaneta fuliginosa, Setville in Korea were evaluated by the topical application method of insecticides. The results obtained were summarized as follows 1. S-biolline showed the most strong susceptibility with LD$_{50}$ of 1.9${\mu}g$ per cockroach (1,100 mg) out of 13 kinds of insecticides and other synthetic pyrethroides insecticides (bio-resmethrin 2.8${\mu}g$/cockroach, permethrin 4.3 ${\mu}g$/cockroach) showed some degree of susceptibility to the smoky brown cockroach. 2. Fenitrothion showed 2.5 $\mu$g per cockroach which was the most strong susceptibility out of 8 kinds of organophosphorus and most of them were good susceptibile but there was clear evidence for developed resistance against malathion with LD$_{50}$ of 80.5 {$\mu}g$ per cockroach (1,100 mg). 3. Lindane showed some degree of susceptibility with LD$_{50}$ of 13.9 {$\mu}g$ per cockroach (1,100 mg) but DDT showed the most strong resistance to the smoky brown cockroach out of 13 kinds of insecticides tested.

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