摘要:

In crucifer plots, incandescent lights attracted many seed-corn beetles,Agonoderus leconteiChandoir andA. comma(F.), which were most prevalent in rows nearest the lights.Damage by the cabbage maggot,Hylemya brassicae(Bouché), to rutabaga and radish plantings was significantly lower in lighted plots than in unlit controls. Seedcom beetles were efficient predators of cabbage maggot immature stages in the laboratory.

ISSN:1754-5692    

DOI:10.1093/ee/5.2.259

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

Bioassay experiments demonstrated that (♂Neoseiulus(=Typhlodromus)fallacis(Garman) (Family: Phytoseiidae) displays behavioral responses to a chemical substance (pheromone) in ether extracts of females. A 3-choice design experiment showed that ether extracts of males do not contain chemicals attractive or repellent to males.

ISSN:1754-5692    

DOI:10.1093/ee/5.2.264

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

TheZ,Eisomer of 3,5-tetradecadien-1-ol acetate was a potent attractant for ♂ carpenterworm moths,Prionoxystus robiniae(Peck), in North Dakota, but only theE,Eisomer attracted ♀ aspen carpenterworms,Acossus centerensis(Litner): Neither isomer greatly inhibited or synergized the response of males of either species to the other isomer.

ISSN:1754-5692    

DOI:10.1093/ee/5.2.267

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

Larval distribution of the pink bollworm was determined by moth emergence from various soil depths at Yuma, AZ. In shredded check plots, 52.2 % of the emergence was calculated to arise from below 10 cm. A delay in spring emergence was as noted in the upper compared to lower soil strata. Total emergence was not signtficantly different where plots were plowed on Nov. 16 immediately after harvest or plowing was delayed to Dec. 12. However, there was a reduction in emergence occurring from the upper 10 cm in the immediate-plowed treatment.

ISSN:1754-5692    

DOI:10.1093/ee/5.2.270

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

When gypsy moth,Porthetria dispar(L.), egg-mass density was low (less than 50 egg masses/acre), density was 10 times higher along the forest edge than within the forest. Man-made objects (MMOs) left along the forest edge in suburban areas contained ca. ½ of the egg masses found at low densities. MMOs that were rough, or dry, or protected from light contained more egg masses than those that were smooth, or frequently moist, or exposed to light. Rough, dry MMOs that were protected from light contained the most egg masses. Apparently, these latter MMOs function as “bark flap” equivalents by providing a degree of protection for the growing larvae and pupae. It is postulated that sparse gypsy moth populations may tend to increase numerically from innocuous levels in situations where abundant larval resting and pupation locations other than the litter are available for the growing insects. Thus, littering the forest edge with MMOs could be a “triggering mechanism” for subsequent gypsy moth outbreaks.

ISSN:1754-5692    

DOI:10.1093/ee/5.2.273

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

An experimental technique for reducing generation time from 23 wk to 7 wk forApanteles fumiferanaeViereck andGlypta fumiferanaeViereck is reported. The 2 Hymenopterous parasites were reared on a non-diapausing strain of their host and both were able to forego diapause.

ISSN:1754-5692    

DOI:10.1093/ee/5.2.277

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

Field cage tests to evaluate the competitiveness between busulfan-fed sterile males of a laboratory strain and fertile males of a field-collected strain were conducted. The field-collected males mated with 66.2% of the released field-collected females and the sterile males mated with 27.0%; 6.8% of the females had apparently mated with both sterile and fertile males.

ISSN:1754-5692    

DOI:10.1093/ee/5.2.279

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

The virion fraction and polyhedral protein fraction of the nuclear polyhedrosis virus of the gypsy moth and the European pine sawfly were found to be not serologically related to arboviruses nor to other viruses tested. In addition, no circulating antibodies to the virion and polyhedral protein fractions of either virus were observed in laboratory workers.

ISSN:1754-5692    

DOI:10.1093/ee/5.2.281

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

Larval feeding rates ofSimulium tescorumStone and Boreham,S. vittatumZetterstedt, andS. argusWilliston in streamlets and that ofS. vittatumin the Colorado River were studied by releasing a water suspension of a fluorescent water disperable particulate dye. The dye particles were readily ingested, forming a discrete plug in the gut visible to the naked eye. The displacement of the dye plug posteriorly provided an easy assessment of the feeding rate in these filter feeding larvae.Feeding rate in younger larvae was greater than in older larvae. Younger larvae ofS. tescorumvoided the dye plug in anywhere from 10 min (water temp 86°F) to 35 min (water temp 55°F), while the older larvae (4–6th instars) voided the dye plug in 20–30 min at the high temperature and 55 min at the lower temperature. Larvae ofS. vittatumandS. argusvoided the plug more slowly than the larvae ofS. tescorum.Larvae ofS. tescorumandS. vittatumshowed no rhythmic feeding activity. They fed at essentially the same rates at all hours of the day.TheS. vittatumlarval feeding rate in the Colorado River was essentially the same as that found in small streamlets.

ISSN:1754-5692    

DOI:10.1093/ee/5.2.283

出版商:Oxford University Press    

年代:1976

数据来源: OUP

摘要:

Arthropod predators in various habitats were sampled weekly with a D-Vac® vacuum insect collector during 1973–75 in the Lower Rio Grande Valley of Texas. Data indicate that non-cultivated habitats support larger numbers of predators/unit area than do cultivated habitats. Over 50% of all predators collected were spiders. The mixed grasses habitat supported the greatest average number of predators/sample. A sharp decline in predator numbers occurred during the summer season in all habitats sampled.

ISSN:1754-5692    

DOI:10.1093/ee/5.2.288

出版商:Oxford University Press    

年代:1976

数据来源: OUP