scholarly journals Geographic Variation in Diapause Induction and Pre-oviposition Period of Adult Females in Haplothrips brevitubus (Thysanoptera: Phlaeothripinae)

2014 ◽  
Vol 58 (1) ◽  
pp. 47-54 ◽  
Author(s):  
Kenji Fujimoto ◽  
Tamito Sakurai ◽  
Shiro Nakao
Keyword(s):  
Geographic Variation ◽  
Diapause Induction ◽  
Oviposition Period ◽  
Adult Females

scholarly journals Geographic Variation in Diapause Induction: The Grape Berry Moth (Lepidoptera: Tortricidae)

2010 ◽  
Vol 39 (6) ◽  
pp. 1751-1755 ◽  
Author(s):  
Jody Timer ◽  
Patrick C. Tobin ◽  
Michael C. Saunders
Keyword(s):  
Geographic Variation ◽  
Grape Berry ◽  
Diapause Induction

Effects of short-term heat stress on the development and reproduction of predatory mite Neoseiulus barkeri (Acari, Phytoseiidae)

2021 ◽  
Vol 26 (4) ◽  
pp. 713-723
Author(s):  
Wei Zhen Li ◽  
Hao Long Li ◽  
Zi Kun Guo ◽  
Su Qin Shang
Keyword(s):  
Heat Stress ◽  
Life Span ◽  
Treatment Time ◽  
Predatory Mite ◽  
Immature Stage ◽  
Oviposition Period ◽  
Hatching Rate ◽  
Short Term ◽  
Developmental Duration ◽  
Adult Females

The predatory mite Neoseiulus barkeri (Acari: Phytoseiidae), which is one of the best natural enemies, has been used as a biological control agent against multiple insect pests, such as spider mite, Tetranychus urticae and thrips. Its growth and development were affected by the environmental temperature changes. This study was conducted to evaluate the hatching rate of the eggs and the immature developmental times of N. barkeri after incubation of the eggs under heat stress at 38, 40 and 42℃, 85% ± 5% RH and a 16h:8h light: dark (L:D) photoperiod for 2, 4 and 6h. After adult females emerged, they were treated under the same conditions again, and the parameters such as oviposition period, fecundity and female longevity were observed. The results showed that with the increase of the temperature and the extension of the duration of the heat stress, the hatching rate was lower. The eggs treated at 42℃ for 2h or more could not hatch, and the developmental duration of each immature stage showed a trend of decreasing at first and then increasing. The fastest development was observed after incubation of eggs at 40℃ for 2h, and the shortest developmental duration was 4.60d. Under the condition of 38℃, the oviposition period and life span of adult females were shortened with the extension of treatment time, and the fecundity decreased at first and then increased. At 40℃, the fecundity, oviposition period and longevity of adult females showed a trend of gradual increase with the extension of treatment time. The shortest oviposition period, the lowest fecundity and the shortest life span of adult females were 12.14d, 18.92 eggs and 16.65d, respectively after incubation of eggs at 40℃, for 2h. Therefore, the short-term heat stress had a significant effect on the hatching rate and the duration of the immature stage, and also had a negative effect on the fecundity, oviposition period and longevity of adult females. In rearing and field release, heat stress should be avoided as much as possible to achieve the best predation and control effect of N. barkeri.

INFLUENCE OF HUMIDITY ON THE PREDACEOUS MITE MELICHARES DENTRITICUS (BERLESE) (ACARINA : ACEOSEJIDAE)

1962 ◽  
Vol 40 (5) ◽  
pp. 761-766 ◽  
Author(s):  
I. Rivard
Keyword(s):  
Food Product ◽  
Prey Population ◽  
Oviposition Period ◽  
Predator Population ◽  
Immature Stages ◽  
Tyrophagus Putrescentiae ◽  
Adult Females ◽  
Rate Of Increase ◽  
Predaceous Mite

The predaceous mite Melichares dentriticus (Berlese) was reared individually on larvae and protonymphs of the stored food product mite Tyrophagus putrescentiae (Schrank) at 68.0° F and 70, 80, 90, and 100% R.H. Survival and speed of development of the immature stages increased slightly with the humidity. Longevity of adult females was similar at different humidities, though the oviposition period was much shorter at 70% R.H. More eggs were laid at 100% R.H., but then the peak of laying occurred later in the oviposition period. The rate of increase of the predator population was altered very little by different humidities in comparison with that of the prey population and thus, assuming that these rates are an accurate guide to the outcome of the interaction, the population of the prey should be better controlled at lower humidities.

scholarly journals Geographic Variation of Diapause Induction and Termination in the Spider Mite Tetrαnychus urticαe: Α mini-review

2017 ◽  
Vol 12 ◽  
pp. 5 ◽  
Author(s):  
S. Koveos ◽  
A. Veerman
Keyword(s):  
Geographic Variation ◽  
Spider Mite ◽  
Wide Distribution ◽  
Mite Species ◽  
Climatic Conditions ◽  
Diapause Induction ◽  
Diapause Termination ◽  
Long Day ◽  
Critical Daylength ◽  
Tetranychus Urticae Koch

In eight strains of the spider mite Tetranychus urticae Koch (Acari: Tetranychidae), originating from different localities in Europe, the critical daylength for diapause induction and termination was almost the same in each strain but varied with the latitudinal origin of the strains; critical daylength was shorter in strains originating from lower latitudes and longer in those from higher latitudes. Diapause intensity, measured as the period of chilling required for diapause termination under a short day photoperiod (LD 10:14) and 19°C, again varied with the latitudinal origin of each strain, being higher the more northern the origin of the strain. An exception were two mountain strains which showed a longer critical daylength and a deeper diapause than expected on the basis of their latitudinal origin. The number of long-day (LD 17:7) cycles required for 50% diapause termination after a certain period of chilling was higher in the northern and lower in the southern strains. These results indicate that geographic strains of T urticae may differ considerably in their diapause attributes, which may be explained as an adaptation to local climatic conditions. The great plasticity of the diapause response may, among other factors, have been responsible for the wide distribution of this mite species.

scholarly journals Geographic Variation of Flight Muscle Dimorphism in Adult Females of a Scarabaeid, Heptophylla picea

1995 ◽  
Vol 30 (4) ◽  
pp. 501-507 ◽  
Author(s):  
Shigeo TADA ◽  
Kenpei HONMA ◽  
Masashi KAKIZAKI ◽  
Kenji FUJISAKI ◽  
Fusao NAKASUJI
Keyword(s):  
Geographic Variation ◽  
Flight Muscle ◽  
Adult Females

INFLUENCE OF TEMPERATURE AND HUMIDITY ON LONGEVITY, FECUNDITY, AND RATE OF INCREASE OF THE MITE TYROPHAGUS PUTRESCENTIAE (SCHRANK) (ACARINA: ACARIDAE) REARED ON MOLD CULTURES

1961 ◽  
Vol 39 (6) ◽  
pp. 869-876 ◽  
Author(s):  
I. Rivard
Keyword(s):  
Egg Production ◽  
Food Products ◽  
Egg Laying ◽  
Oviposition Period ◽  
Tyrophagus Putrescentiae ◽  
Influence Of Temperature ◽  
Adult Females ◽  
Rate Of Increase ◽  
Temperature And Humidity

Adult females of Tyrophagus putrescentiae (Schrank), a mite that infests stored food products, were reared individually on mold cultures at all combinations of five temperatures and four humidities. A definite diminution in life usually occurred with increase in either temperature or humidity, and the oviposition period was the most affected. Total egg-production and rate of laying were highest at 72.5° F and 90% R.H., and both generally decreased with an increase in temperature or decrease in humidity from these values. Peak of egg-laying, however, was reached sooner at higher temperatures but egg-production was maintained at relatively high levels for shorter periods. Rate of increase was greatest and approximately the same at 90% R.H. within the range 72.5° to 81.5° F.

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