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Relative Efficiency of Certain Sampling Methods for the Assessment of the Larval and Pupal Populations of the Cotton Leafworm Spodoptera littoralis (Boisd.) in Clover Fields (Lepid.: Agrotidae)
Author(s) -
AbulNasr Salah,
ElSherif S. I.,
Naguib M. A.
Publication year - 1971
Publication title -
zeitschrift für angewandte entomologie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0044-2240
DOI - 10.1111/j.1439-0418.1971.tb03189.x
Subject(s) - spodoptera littoralis , pupa , larva , biology , population , horticulture , toxicology , botany , noctuidae , demography , sociology
The present investigation evaluates the relative efficiency of certain sampling methods for the assessment of the larval and pupal populations of the cotton leafworm, Spodoptera littoralis (Boisd.) in clover fields. Sampling was carried out in four successive seasons (1963/64, 1966/67), at three aparted regions (Sakha, Giza and Sids). It was indicated that, for assessing larval population density, soil‐sieving method was more reliable than net‐sweeping or row‐clearing methods. For the assessment of pupal population density, row‐clearing method proved more efficient than that of soil‐sieving. Zusammenfassung Über die Brauchbarkeit verschiedener Sammelmethoden zur Ermittlung der Larven‐ und Puppendichte der Baumwolleule Spodoptera littoralis (Boisd.) in Kleefeldern Die Versuche wurden 1963‐1967 in 3 Regionen Ägyptens (Sakha, Giza und Sids) durch‐geführt. Es zeigte sich, daß für die Dichte‐Bestimmung der Larven die Bodensiebungs‐Methode zuverlässiger war als die Käscher‐ und die Bodensuch‐Methode. Dagegen erwies sich zur Bestimmung der Puppendichte die Bodensuchmethode als die beste.