Influence of temperature on spinosad toxicity in different populations of Plutella xylostella (Linnaeus)

Diamond back moth, Plutella xylostella (Linnaeus) is one of the major insect-pest of cole crops, causing high yield losses. In present study, larval populations of P. xylostella, collected from different regions of Punjab i.e. Amritsar, Kapurthala, Malerkotla and Ludhiana were exposed to different concentrations of spinosad at 15, 20, 25 and 30 °C for evaluation of LC values. The LC (Lethal 50 50 concentration) increased from lower (15 °C) to higher (30 °C) temperature for all populations of P. xylostella. Negative correlation was observed between the temperature coefficient and toxicity of spinosad towards P. xylostella populations, which decreased with increase in temperature. The LC 50 values varied among different populations of P. xylostella i.e. Amritsar populations with higher LC values 50 followed by Kapurthala, Malerkotla and Ludhiana populations. The temperature and insecticide exposure history both affected the toxicity of spinosad for P. xylostella. The information would be helpful in developing management strategies for P. xylostella according to prevailing environment conditions.

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Effect of Temperature on the Predator, (Reuter) (Hemiptera: Anthocordiae) Feeding on Cryptolestes pusillus (Schon.) (Coleoptera: Cucujidae)

Journal of Bio-Science ◽

10.3329/jbs.v15i0.2201 ◽

1970 ◽

Vol 15 ◽

pp. 41-46 ◽

Cited By ~ 1

Author(s):

MM Rahman ◽

W Islam ◽

KN Ahmed

Keyword(s):

Life History ◽

Insect Pest ◽

Developmental Time ◽

Effect Of Temperature ◽

Hatching Rate ◽

Immature Stages ◽

Egg Hatching ◽

Influence Of Temperature ◽

Influence Of Temperature On ◽

Cryptolestes Pusillus

Xylocoris flavipes (Reuter) is one of the dominant predators of many stored product insect pest including Cryptolestes pusillus. The influence of temperature on predator development, survival and some selected life history parameters was determined. Eggs laid/female (27.27Â±2.52) and egg hatching rate (%) (88.25Â±2.19) were highest at 30Â°C and lowest at 20Â°C (5.43Â±1.19 and 30.79Â±4.63%) respectively but no eggs laid at 15Â°C. Mortality among immature stages (%) was highest (51.71Â±1.48) at 35Â°C and lowest (24.25cÂ±1.14) at 25Â°C. Developmental times decreasing with the increasing of temperature. Maximum numbers of progeny/female/day (3.55Â±0.76) were produced at 25Â°C and minimum (0.83Â±0.04) were at 20Â°C.The sex ratios (% female) of X. flavipes were 47.04, 56.68, 51.66 and 50.07 for 20, 25, 30 and 35Â°C respectively. Survivorship of ovipositing females was highest at 25Â°C but lowest at 35Â°C respectively. Key words: Xylocoris flavipes, Cryptolestes pusillus, life history, temperature, developmental time Â doi: 10.3329/jbs.v15i0.2201 J. bio-sci. 15: 41-46, 2007

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The influence of temperature on life history traits of Diadegma mollipla (Hymenoptera: Ichneumonidae), an African parasitoid of the diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae)

BioControl ◽

10.1007/s10526-017-9834-8 ◽

2017 ◽

Vol 62 (5) ◽

pp. 603-612 ◽

Cited By ~ 1

Author(s):

Rudo Sithole ◽

Bernhard Löhr ◽

Paradzayi Tagwireyi

Keyword(s):

Life History ◽

Plutella Xylostella ◽

Life History Traits ◽

Diamondback Moth ◽

Influence Of Temperature ◽

Influence Of Temperature On

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Influence of temperature on the occurrence of Myzus persicae (Sulzer) (Hemiptera: Aphididae) parasitoids in tobacco crops in Rio Grande do Sul, Brazil

Revista Facultad Nacional de Agronomía Medellín ◽

10.15446/rfnam.v72n2.72192 ◽

2019 ◽

Vol 72 (2) ◽

pp. 8801-8808

Author(s):

Cleder Pezzini ◽

Daniela Da Costa e Silva ◽

Andreas Köhler

Keyword(s):

Myzus Persicae ◽

Thermal Tolerance ◽

Management Strategies ◽

Parasitoid Wasp ◽

Rio Grande ◽

Rio Grande Do Sul ◽

Aphidius Colemani ◽

Influence Of Temperature ◽

Influence Of Temperature On ◽

Plastic Containers

The aphid Myzus persicae (Sulzer) (Hemiptera: Aphididae) is considered one of the main pests in tobacco crops. By knowing their natural enemies, such as parasitoid wasp, is the first step to develop management strategies for the biological control of the aphids using local agents. For the success of using this tool, it must be considered some environmental factors like thermal tolerance. Therefore, the objective of this work was to survey the occurrence of the parasitoids of M. persicae associated with tobacco crops in the state of Rio Grande do Sul, Brazil, as well as to evaluate the influence of temperature on the occurrence of these parasitoid species. During four crop seasons, tobacco leaves infested with aphids were collected in 42 cities of Rio Grande do Sul. The leaves with aphids were conditioned in plastic containers for ten days for later screening and verification of parasitoids’ emergence. In total, 2963 individuals of two emerging species were sampled: 78% were Aphidius colemani Viereck (Hymenoptera: Braconidae), and 22% were Praon volucre (Haliday) (Hymenoptera: Braconidae). Among the 42 cities sampled, the occurrence of parasitoids was detected in 25 of them. Under the conditions of this study, it was confirmed the influence of the temperature on the populations of the parasitoids of M. persicae. Individuals of P. volucre occurred preferably in temperatures below 22 °C, unlike to A. colemani, which preferred higher temperatures, above 22 °C, showing a different thermal tolerance between both species.

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The effect of temperature on high-resolution TEM image contrast

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100139573 ◽

1995 ◽

Vol 53 ◽

pp. 640-641

Author(s):

T. Geipel ◽

W. Mader ◽

P. Pirouz

Keyword(s):

Form Factor ◽

Inelastic Scattering ◽

Accurate Method ◽

Waller Factor ◽

Effect Of Temperature ◽

Specimen Thickness ◽

Influence Of Temperature ◽

Debye Waller Factor ◽

Influence Of Temperature On ◽

Atomic Form Factor

Temperature affects both elastic and inelastic scattering of electrons in a crystal. The Debye-Waller factor, B, describes the influence of temperature on the elastic scattering of electrons, whereas the imaginary part of the (complex) atomic form factor, fc = fr + ifi, describes the influence of temperature on the inelastic scattering of electrons (i.e. absorption). In HRTEM simulations, two possible ways to include absorption are: (i) an approximate method in which absorption is described by a phenomenological constant, μ, i.e. fi; - μfr, with the real part of the atomic form factor, fr, obtained from Hartree-Fock calculations, (ii) a more accurate method in which the absorptive components, fi of the atomic form factor are explicitly calculated. In this contribution, the inclusion of both the Debye-Waller factor and absorption on HRTEM images of a (Oll)-oriented GaAs crystal are presented (using the EMS software.Fig. 1 shows the the amplitudes and phases of the dominant 111 beams as a function of the specimen thickness, t, for the cases when μ = 0 (i.e. no absorption, solid line) and μ = 0.1 (with absorption, dashed line).

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