摘要:

Adult maleCochliomyia hominivorax(Coquerel) were immersed 5 seconds in either watcr or 0.5%N,N'-tetramethylenebis(1-aziridine carboxamide), held at 15°, 27°, or 35°C until half the flies died; the survivors were then mated with untreated virgin females. Exposure to 15° or 35°C reduced the fertility of chemosterilant-treated males more than exposure to 27°C; exposure to 15°C also reduced the fertility of water-treated males.

ISSN:1754-5692    

DOI:10.1093/ee/2.1.145

出版商:Oxford University Press    

年代:1973

数据来源: OUP

摘要:

Three stored-product phycitid moths were exposed 2 hours daily for 6 days to atmospheres containing about 96% CO2, Egg hatch was completely eliminated in the Mediterranean flour moth,Anagasta kuehniella(Zeller), and was less than 2% in the almond moth,Cadra cautella(Walker). Carbon dioxide was slightly less effective in preventing egg hatch in the Indian meal moth,Plodia interpunctella(Hübner). A large reduction in oviposition occurred in all 3 species.

ISSN:1754-5692    

DOI:10.1093/ee/2.1.147

出版商:Oxford University Press    

年代:1973

数据来源: OUP

摘要:

Seedling progeny from several sugarcane crosses were evaluated for host plant resistance toDiatraea saccharalis(F.) by artificially infesting plants with 1st-stage larvae. Adequate distribution of larvae among plants could not be obtained by infesting one centrally located seedling in series grown in flats. For this reason each seedhling was individually infested with known numbers of larvae. Three successive infestations at a rate of 2 larvae per plant eliminated more than 90% of the seedlings tested. More than 50% of the larvae were recovered during dissection of seedlings. Percentages of selection among different crosses, based on seedling elimination, ranged from 0.0% to 5.4%. The degree of seedling elimination was closely correlated with resistance or susceptibility of parental varieties except in one cross. The seedling-selcction technique appears useful as an efficient means of screening large amounts of sugarcane germ plasm, but its validity remains in doubt until the performance of the seedlings selected can be evaluated in varietal field trials.

ISSN:1754-5692    

DOI:10.1093/ee/2.1.149

出版商:Oxford University Press    

年代:1973

数据来源: OUP

摘要:

In a 2-year study, fruits from 21 plant types of 15 species from 6 genera (Citrullus, Cucumis, Cucurbita, Lagenaria, Luffa, andMomordica) of Cucurbitaceae were exposed to a natural population ofDiabrotica undecimpunctata howardiBarber to determine relative attractance of thc fruits to that insect. Analysis of cucurbitacins and their glycosides in the fruits revealed a positive correlation between their concentration and the number of spotted cucumber beetles attracted by the various plant species. This correlation dcmonstrated the attraction properties of low concentration (0.0–0.56 mg/g) of curcurbitacins and their glycosides.Cucurbita foetidissimaH. B. K.andCucumis dipsaceusEhrenb., the 2 most attractive species, were high in cucurbitacin concentration. The technique of exposing fruits toD. undecimpunctata howardihas potential as a bioassay to screen cucurbitacins in the fruits of other species. Attractant cucurbitacins can be useful in population assessment and in luring the beetle to an insecticide or to an adhesive.

ISSN:1754-5692    

DOI:10.1093/ee/2.1.154

出版商:Oxford University Press    

年代:1973

数据来源: OUP

摘要:

Nest construction in hollowed-out plant stems or abandoned beetle burrows poses special problems for those solitary bee and wasp species involved. Typically they select a nest bore diameter only slightly greater than the body diameter (Krombein 1967, Michener 1970). and thus cannot turn around inside. Moreover, the cells of the nest are constructed in a linear series separated by partitions. so emergence of the next generation must proceed in an orderly progression. Correct orientation at pupation is vital for survival, because a misdirected cocoon not only causes the individual to become fatally trapped, but will often doom its siblings earlier in the cell series. We here report evidence that cocoon orientation by the solitary megachilid bee,Osmia lignariaSay, is primarily determined by reference to the placement of the pollen food store within the cell.

ISSN:1754-5692    

DOI:10.1093/ee/2.1.157

出版商:Oxford University Press    

年代:1973

数据来源: OUP