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Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCES   FALL 2007 , Volume 13 , Number 3; Page(s) 583 To 892.
 
Paper: 

IDENTIFICATION OF WALNUT FRUIT WORMS SPECIES AND THEIR RELATIVE ABUNDANCE IN WEST AZARBAIJAN WALNUT ORCHARDS

 
 
Author(s):  AKBARZADEH SHOUKAT GH.A.*
 
* AGRICULTURAL AND NATURAL RESOURCE RESEARCH CENTER OF WEST AZARBAIJAN
 
Abstract: 

Walnut fruit worms are known as the main pests of walnut fruit throughout the world. In West Azarbaijan province which is one of the suitable walnut growing regions in Iran, it has a considerable damage. In this study the species of walnut fruit worms were determined based on the specimens collected from all over the province during 2000-200 1.Their relative abundance were studied by using various methods including cloth sleeves, trap bands, mass rearing of the specimens taken from infested fruits of Kahriz Horticulture Station. The population density of prevalent species was compared in apple and walnut orchardsbased on sex pheromone trap catches. The results revealed that two moth species including codling moth, Cydia pomonella (L.) and quince moth, Euzophera bigella (Zeller) are involved in causing damage to walnut fruit and c.pomonella was found to be the predonminant species with 63 percent of the population.
Damage of walnut fruit worm was observed in Oroumieh, Salmas, Khoy, Oshnavieh, Piranshahr, Sardasht, Mahabad and Miandoab. The two years study in Kahriz Horticulture Station also showed that, the relative abundance of both pest species varied in accordance with the method of assessment used Studies showed that the mean ratios of percentage of abundance of c.pomonella (L.) and E.bigella (Zeller) obtained from cloth sleeves, trap bands and laboratory rearing was found to be 80:20; 73:27, and 40:60 percent respectively. Keeping single walnut fruits, randomly taken from experimental orchard, in cages in the laboratory showed that 38 percent of the fruits were infested with one and only 3 percent with two larvae of C. pomonella (L.); while 34 percent of the fruits were infested with only one, 14 percent with two, and 11 percent with three to five larvae of E. bigella. As well 16 percent of the specimens were infested with both C. pomonella (L.) and E. bigella (Zeller). One Trichogramma egg parasitiod wasp was collected from Orumieh and identified as Trichogramma embryophagum (Hartig). Its parasitoidism rate was found about 50 percent on eggs of Cydiapomonella (L.) in Barbaran Valley of Orumieh in mid July.

 
Keyword(s): WALNUT, CYDIA POMONELLA, EUZOPHERA BIGELLA, TRAP BAND, SEX PHEROMON
 
References: 
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