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| 41. |
Phenological Model for Gypsy Moth,Lymantria dispar(Lepidoptera: Lymantriidae), Larvae and Pupae |
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Environmental Entomology,
Volume 16,
Issue 2,
1987,
Page 556-562
Richard A. Casagrande,
Patrick A. Logan,
William E. Wallner,
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摘要:
A phenological model for gypsy moth,Lymantria dispar(L.), was developed on the basis of 3 yr of laboratory experiments with constant temperature exposures. The model was validated by variable temperature exposures in the laboratory and further validated by field tests at two locations. This model is based upon a simple sigmoid equation for development rate as a function of temperature, and a Weibull function describing distribution of development times of individuals. Host influence on development was incorporated into the model by evaluating previously published works on 10 host species. With required inputs of egg-hatch data and temperatures, the model may be used to predict completion of first through fourth instars, completion of larval development of both sexes, and emergence of adults of both sexes.
ISSN:0046-225X
DOI:10.1093/ee/16.2.556
出版商:Oxford University Press
年代:1987
数据来源: OUP
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| 42. |
Development Time ofPlagithmysus bilineatus(Coleoptera: Cerambycidae) at Different Locations on the Island of Hawaii |
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Environmental Entomology,
Volume 16,
Issue 2,
1987,
Page 563-568
John D. Stein,
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摘要:
Development time forPlagithmysus bilineatusSharp was studied on the northeast slope of Mauna Loa, on the island of Hawaii. Host substrates (bolts and live stumps) ofMetrosideros polymorpha(Gaudichaud) were monitored at four sites 305, 915, 1,274, and 1,707 m high. Mean development time ranged from 160 to 380 d and was significantly influenced by temperature, site, and host substrate. Longer development time was associated with lower temperatures, sites at higher elevations, and live host tissue. The estimating equation that included parameters for late instars, the pupal stage, and location explained 91% of the variation for development in bolts with a 95% prediction interval of 75 d. The best estimating equation for development in live stumps explained 76% of the variation, with a 95% prediction interval of 123 d.
ISSN:0046-225X
DOI:10.1093/ee/16.2.563
出版商:Oxford University Press
年代:1987
数据来源: OUP
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| 43. |
Effect of European Red Mite (Acari: Tetranychidae) Injury on Vegetative Growth and Flowering of Four Cultivars of Apples |
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Environmental Entomology,
Volume 16,
Issue 2,
1987,
Page 569-574
E. H. Beers,
Larry A. Hull,
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PDF (455KB)
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摘要:
Effect of European red mites (ERM),Panonychus ulmi(Koch), on nonbearing spur-type and standard ‘Delicious’, ‘Golden Delicious’, and ‘Stayman’ apple trees was compared over a 3-yr period. Mite population levels ranged from ca. 0–2,000 mite-d, with each tree receiving about the same amount of mite-days each year. Shoot length, leaf numbers, and trunk girth were little affected by mite damage, but early defoliation occurred on ‘Golden Delicious’ and standard ‘Delicious’. Flowering was reduced on ‘Golden Delicious’ and ‘Stayman’, but not on either of the ‘Delicious’ types. In general, ‘Delicious’ appeared to be more tolerant of ERM damage.
ISSN:0046-225X
DOI:10.1093/ee/16.2.569
出版商:Oxford University Press
年代:1987
数据来源: OUP
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