Author： OKIWELU S. N.
Publisher： Entomological Society of America
ISSN： 1938-2901
Source： Annals of the Entomological Society of America, Vol.70, Iss.4, 1977-07, pp. : 615-621
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
There was no significant correlation either between temperature and duration of crawler production or between temperatures and numbers of females not producing crawlers. However, the numbers of crawlers produced per female were significantly different at different constant temperatures, with the least at 15 and 35°C. The number of crawlers produced per female was not significantly affected by relative humidity, except at relatively low temperatures. Correlations between constant temperatures and cumulative percentage mortality were only significant during the periods 0–1 day and 1–2 days after crawler emergence. The relationship between relative humidity and cumulative mortality was not significant. Settling time and distance of settling of crawlers from parent femals were not significantly influenced by whether they emerged early or late in the season. No significant difference was observed between numbers of crawlers settling above or below the point of release and no significant correlation existed between settling time and distance of settling from parent female. The correlation between log of the avg length of crawlers and age in weeks was highly significant. In the field, the range of crawlers produced per female was 7–50; females produced crawlers discontinuously and maximum duration of crawler production by individual females was 5 mo. All single females observed started crawler production in late Apr. Newly-emerged crawlers had no significant preference for either the distal or proximal directions on horizontal and vertical twigs. Emergence patterns of crawlers from females at different exposures on trees were similar, and more than 50% of all crawlers trapped emerged in May. The July population exhibited a 2nd but lower peak.
Related content
Access to resources
Recommend
Annals of the Entomological Society of America, Vol. 70, Iss. 4, 1977-07 ,pp. :
Annals of the Entomological Society of America, Vol. 72, Iss. 5, 1979-09 ,pp. :