摘要:

In field tests in abandoned and commercial orchards in New York, sticky-red spheres baited with a blend of synthetic apple volatiles captured significantly more male and female apple maggot flies,Rhagoletis pomonella(Walsh), than unbaited spheres. Polyethylene caps loaded with 50 and 100 mg of the blend were more effective than those containing 300 mg. The volatiles did not increase the effectiveness of sticky-yellow panels (Pherocon AM) during early-season tests.

ISSN:0046-225X    

DOI:10.1093/ee/11.6.1294

出版商:Oxford University Press    

年代:1982

数据来源: OUP

摘要:

A model ofOoencyrtus kuvanae(Howard) population dynamics is developed. The model incorporates an enzyme kinetics formulation of parasitism rate with a Leslie matrix. Field data onO. kuvanaeabundance from 11 plots in central Pennsylvania were used to validate the model. These data were taken from areas where gypsy moth,Lymantria dispar(L.), population densities ranged from 66 to 27,830 egg masses per ha; plots were located in each of the five population stages: low, building, high stable, outbreak, and collapse. The model accurately simulated the behavior ofO. kuvanaepopulations. The predictions of actual parasite abundance were very good in areas with outbreak gypsy moth populations; they were progressively poorer in less dense host populations. This discrepancy indicates that the host-finding ability ofO. kuvanaeis less efficient in areas of low host density than in areas of high density. Inferences from the model verified the occurrence of two generations and a partial third generation of the parasites in the late summer and autumn, and thatO. kuvanaeabundance is not limited by food.

ISSN:0046-225X    

DOI:10.1093/ee/11.6.1299

出版商:Oxford University Press    

年代:1982

数据来源: OUP

摘要:

The efficacy ofBacillus thuringiensisBerliner against the southern pine coneworm,Dioryctria amatella(Hulst), was determined in laboratory bioassays. First-stage larvae were most susceptible toB. thuringiensiswith an LC50value of 0.64 IU/ml diet. Older larvae became less susceptible toB. thuringiensis, but died more quickly. The LC50for second stage larvae on loblolly pine,Pinus taedaL., cone dipped in water suspensions ofB. thuringiensiswas 42.3 IU/ml. These data indicate thatD. amatellalarvae are highly susceptible toB. thuringiensis.

ISSN:0046-225X    

DOI:10.1093/ee/11.6.1305

出版商:Oxford University Press    

年代:1982

数据来源: OUP

摘要:

Parameters were estimated for a temperature-dependent model of postdiapause development and spring emergence of the overwintering generation of European corn borer (ECB) in North Carolina. Controlled-temperature studies examined ECB postdiapause development at several-constant temperatures: 13.7, 15, 17.2, 18, 19.2, 22, 25, 30, 32, and 35 ± 1°C. From these data, development rate vs. temperature curves were constructed and incorporated into a model predicting ECB spring emergence for 10, 50, and 90% of the overwintered generation. The model was validated by using temperature data and blacklight trap records from four counties in eastern North Carolina. The model provided good prediction at all percentiles of emergence, but there was a tendency toward early predictions at the 90% level.

ISSN:0046-225X    

DOI:10.1093/ee/11.6.1307

出版商:Oxford University Press    

年代:1982

数据来源: OUP

ISSN:0046-225X    

DOI:10.1093/ee/11.6.1312

出版商:Oxford University Press    

年代:1982

数据来源: OUP

ISSN:0046-225X    

DOI:10.1093/ee/11.6.1313

出版商:Oxford University Press    

年代:1982

数据来源: OUP