Within-plant distribution of the immatures of Heliothis zea (Boddie) on cotton
AuthorsL. T. Wilson
A. P. Gutierrez
T. F. Leigh
Authors AffiliationsL. T. Wilson was formerly Graduate Student, Department of Entomology, Davis, is employed at Plant Industry, CSIRO, Narrabri, N.S.W., Australia, 2390; A. P. Gutierrez was Entomologist, Division of Biological Control Department of Entomological Sciences, Berkeley; T. F. Leigh was Entomologist, U.S. Cotton Research Station, Shafter, and Lecturer, Department of Entomology, Davis.
Hilgardia 48(2):12-23. DOI:10.3733/hilg.v48n02p012. February 1980.
A detailed study of the within-plant distribution of cotton bollworm (Heliothis zea (Boddie)), its eggs and larvae, was conducted in the field, and sampling schemes for them were developed.
The average location of bollworm eggs was approximately one-third of the distance in nodes from the terminal, while older larvae were found lower on the plant than younger larvae. The sampling scheme for bollworm eggs relies on the finding that the mainstem leaves are the preferred oviposition site. Field observations indicate that early first instar larvae can be detected in squares by the presence of frass and the flaring of the bracts. These criteria are used in a suggested sampling scheme for first-through-third instar larvae.
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