Management of lepidopterous pests of cabbage in the Texas rolling plains.

Bibliographic Details
Main Author:	Kirby, Ronald Dale
Other Authors:	Adkisson, P. L. (degree committee member.), Clark, L. E. (degree committee member.), Pike, L. M. (degree committee member.)
Format:	Thesis Book
Language:	English
Published:	1981.
Subjects:	Cabbage > Disease and pest resistance > Texas. Insect pests > Control > Biological control > Texas. Insect pests > Control > Economic aspects > Texas. Lepidoptera > Control > Texas. Entomology. Texas. Academic theses.
Online Access:	Link to ProQuest Copy Link to OAKTrust copy

Description
Abstract:	A composite economic threshold was developed for use in management of lepidopterous cabbage pests. Major emphasis was on the cabbage looper, Trichoplusia ni (Hubner), diamondback moth, Plutella xylostella (L.), and imported cabbageworm, Pieris rapae (L.). A multiple regression model was developed which describes percent marketable yield as a function of: seasonal number of "all" lepidopterous larvae per plant (A), percent T. ni larvae > 13 mm in length prior to the plant stage of cupping (P), mean seasonal temperature in [DEGREES]C (T), and the interactions among these three variables. The threshold was shown to be dynamic, but a static, composite threshold of .3 larvae/plant consistently produced > 80% marketable yield. Insecticide treatment schedule based on assessment of [UNKNOWN] density resulted in a reduction of 1 - 4.5 application below the number used in the 5- to 6-day automatic schedule. ...
Item Description:	"Major subject: Entomology." Typescript (photocopy). Vita.
Physical Description:	xiv, 112 leaves : illustrations ; 29 cm
Bibliography:	Includes bibliographical references (leaves 101-106).