A METHOD OF SAMPLING BALSAM WOOLLY APHID ON FRASER FIR IN NORTH CAROLINA

被引：8

作者：

AMMAN, GD

机构：

[1] Southeastern Forest Experiment Station, Forest Service, U.S. Department of Agriculture, Asheville, North Carolina

来源：

CANADIAN ENTOMOLOGIST | 1969年 / 101卷 / 08期

关键词：

D O I：

10.4039/Ent101883-8

中图分类号：

Q96 [昆虫学];

学科分类号：

摘要：

Populations of the balsam woolly aphid on Fraser fir trees were sampled without replacement. Sampling frequency was based on the embryological period of the aphid at mean monthly temperatures in the field. The sample for each date consisted of 16 pieces of bark, 1/2 in. diameter, from each of 10 trees. Precision of the method was usually within ±10% of the mean. The largest proportion of variance was within trees. Stratification of samples by levels within trees decreased variance estimates.Frequency distributions of counts of most stages of the aphid approximated the negative binomial distribution. Therefore, data were transformed to logarithms in order to approximate the normal distribution. © 1969, Entomological Society of Canada. All rights reserved.

引用

页码：883 / &

共 8 条

[1] EFFECTS OF TEMPERATURE AND HUMIDITY ON DEVELOPMENT AND HATCHING OF EGGS OF ADELGES PICEAE [J].

AMMAN, GD .

ANNALS OF THE ENTOMOLOGICAL SOCIETY OF AMERICA, 1968, 61 (06) :1606-&

[2] SEASONAL BIOLOGY OF BALSAM WOOLLY APHID ON MT MITCHELL, NORTH CAROLINA [J].

AMMAN, GD .

JOURNAL OF ECONOMIC ENTOMOLOGY, 1962, 55 (01) :96-&

[3]

BALCH RE, 1952, 867 CAN DEP AGR PUBL

[4]

Kloft W., 1957, Zeitschrift fur Angewandte Entomologie, V41, P438

[5]

KOTINSKY J., 1916, Proceedings of the Entomological Society of Washington, V18, P14

[6]

NAGEL WP, 1959, 100 US FOR SERV SOUT

[7]

Pschorn-Walcher H., 1958, Z ANGEW ENTOMOL, V42, P241

[8]

SPEERS CHARLES F., 1958, JOUR FOREST, V56, P515

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