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Paper Information

Journal:   THE SCIENTIFIC JOURNAL OF AGRICULTURE (SJA)   MARCH 2008 , Volume 30 , Number 4-A; Page(s) 49 To 60.
 
Paper: 

ECONOMIC INJURY LEVEL OF SECOND GENERATION OF PULVINARIA AURANTII (COCKERELL) ON THOMPSON NAVEL ORANGE IN SARI REGION

 
 
Author(s):  RAJABPOUR A.*, SERAJ A.A., DAMAVANDIAN M.R., SHISHEHBOR P.
 
* PLANT PROTECTION FACULTY OF SHAHID CHAMRAN UNIVERSITY
 
Abstract: 

Pulvinaria aurantii (Cockerell) is the most important citrus pest in Mazandaran province, Iran. Economic injury levels for 2nd generation of P. aurantii were studied on Thomson novel in Sari (North of Iran). A commercial orchard of Thomson navel with fifteen rows, each containing between 60 and 70 trees, during 2002 and 2003. For determination of EIL, trees of the orchard, according to infestation level of Fumagin and the number of 1st and 2nd instar of nymph, were divided to 4 groups (no infestation, low infestation, medium infestation and high infestation). Among trees of each group, 12 trees were selected randomly. The number of nymphs and average of clean fruit yield were recorded and then regression relation was established between them. This regression relation was significant (p<0.001) and negative. The results showed that P. aurantii not only the mean clean fruit yield but also the mean total fruit yield (infested and no-infested fruit with Fumagin) were significantly reduced (p<0.01) in high infestation. EIL of P. aurantii was verified from 16 to 19 (nymphs/24 leave/trees) depending on the product prices and control action costs.

 
Keyword(s): PULVINARIA AURANTII, ECONOMIC DAMAGE, ECONOMIC INJURY LEVEL
 
References: 
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  Persian Abstract Yearly Visit 71
 
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