Japanese Journal of Applied Entomology and Zoology
Online ISSN : 1347-6068
Print ISSN : 0021-4914
ISSN-L : 0021-4914
Search
Advanced search
OR
Browse
Search
Volume 56, Issue 2
Displaying 1-15 of 15 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Original Articles
  • Effect of Agrichemicals on the Polyphagous Predatory Bug, Geocoris varius (Uhler) (Heteroptera: Geocoridae)
    Yumika Satoh, Youichi Kobori, Hiroshi Oida, Masashi Nomura, Hidetsugu ...
    Article type: Original Articles
    2012 Volume 56 Issue 2 Pages 43-48
    Published: May 25, 2012
    Released on J-STAGE: June 07, 2012
    DOIhttps://doi.org/10.1303/jjaez.2012.43
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The big-eyed bug Geocoris varius (Uhler) is a polyphagous predatory species distributed throughout agricultural areas of Japan. Although G. varius has much potential as a biological control agent, relatively little is known about the effects of agrichemicals on this species. We therefore evaluated the toxicity of eleven agrichemicals on 2nd instar nymphs of G. varius by topical application and oral administration. Using topical application, Fluvalinate, Methomyl, Chlorfenapyr, Pyridalyl, Sulfur and Triflumizole were harmless or slightly harmful to nymph survival. Conversely, topical application of five agrichemicals, including two insect growth regulator (IGR) chemicals, Dichlorvos, Acetamiprid, Chlorfluazuron (IGR), Lufenuron (IGR) and Pyridaben were moderately harmful or harmful to nymph survival. An examination of the oral toxicity of Dichlorvos, Methomyl, Acetamiprid and Pyridalyl showed that these four agrichemicals had little effect (slightly harmful) on the survival of nymph bugs. We also evaluated the sub-lethal effects (No. of consumed eggs of Ephestia kuehniella and developmental days of nymph, and head capsule width of emerged adult bug) of Chlorfenapyr, Pyridalyl, Sulfur and Triflumizole. These results showed that the characteristics of treated nymphs was not significantly different from those of untreated nymph bugs.
    View full abstract
    Download PDF (873K)
  • Development and Reproduction of Five Populations of the Foxglove Aphid, Aulacorthum solani (Kaltenbach) (Hemiptera: Aphididae), on Nine Soybean Cultivars
    Masafumi Kobayashi, Tamotsu Murai
    Article type: Original Articles
    2012 Volume 56 Issue 2 Pages 49-55
    Published: May 25, 2012
    Released on J-STAGE: June 07, 2012
    DOIhttps://doi.org/10.1303/jjaez.2012.49
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Development and reproduction of five populations of foxglove aphid, Aulacorthum solani (Kaltenbach), were investigated in nine soybean cultivars. Significant differences were observed in the development duration, aphid fecundity and the intrinsic rate of the natural increase of the aphid populations reared on the soybean cultivars. A delay in aphid development and a decrease in aphid fecundity were observed in all aphid populations reared on ‘Adams,’ an aphid-resistant soybean cultivar. In the Tochigi aphid population reared on ‘William82,’ a soybean cultivar that is susceptible to soybean aphid, a marked delay in aphid development was observed. In addition, aphid fecundity decreased and the intrinsic rate of the natural increase was very low. No resistance was observed in the four remaining aphid populations. The Toyama and Hokkaido populations exhibited similar patterns of development and reproduction when reared on the nine soybean cultivars. Thus, in order to assess the development of aphid resistance in soybean cultivars, the findings of this study suggest that the biological performance of aphids on soybean cultivars should be investigated using other aphid populations from different locations and biotypes.
    View full abstract
    Download PDF (896K)
  • Evaluation of Black-eyed Susan Rudbeckia hirta L. (Asterales: Asteraceae) as an Insectary Plant for a Predacious Natural Enemy Orius sauteri (Poppius) (Heteroptera: Anthocoridae)
    Kazuya Nagai, Mitsuharu Hikawa
    Article type: Original Articles
    2012 Volume 56 Issue 2 Pages 57-64
    Published: May 25, 2012
    Released on J-STAGE: June 07, 2012
    DOIhttps://doi.org/10.1303/jjaez.2012.57
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Black-eyed Susan Rudbeckia hirta L. was evaluated as an insectary plant of a minute pirate bug, Orius sauteri (Poppius). In reinforced greenhouses, we established a treatment plot in which black-eyed Susan growing in planter boxes was arranged along the tomato rows, and a control plot of tomato without black-eyed Susan. O. sauteri and its prey, such as aphids, whiteflies and thrips occurred on the black-eyed Susan from mid-July to late September. On the black-eyed Susan, a relatively high population density of O. sauteri was maintained from mid-August to mid-September even when the population density of the prey was very low. Two species of whitefly, Trialeurodes vaporariorum (Westwood) and Bemisia tabaci (Gennadius) occurred on tomatoes in both plots during the duration of this experiment. The population density of O. sauteri on tomatoes in the treatment plots increased as did that on black-eyed Susan; however, the population density of O. sauteri on tomatoes in the control plot showed no increase throughout the study. The population density of O. sauteri on tomatoes in the treatment plots was significantly higher than that in the control plots (two-factor repeated measures ANOVA, p<0.05). The results indicate that the high density of O. sauteri on tomatoes in the treatment plot is due to immigration of O. sauteri from black-eyed Susan to tomato; however, the difference in the population densities of whiteflies between the two plots was not significant (two-factor repeated measures ANOVA, p>0.05).
    View full abstract
    Download PDF (1351K)
Short communications
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top