Seasonal population fluctuations of the cabbage white butterfly, Pierisrapaein cauliflower fields of the South of Tehran

Subject Areas : Plant Protection

Gholamhosein Hasanshahi ¹ , Zahra Dousti ² , Fatemeh Jahan ³ , Alireza Askarianzadeh ⁴ , Jaber Karimi ⁵ , Habib Abbasipur ⁶

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Received: 2011-05-11 Accepted : 2012-03-11 Published : 2012-03-20

Keywords:

Abstract :

The cabbage white butterfly, Pierisrapae (Linnaeus, 1758) (Lep.: Pieridae) is one of the most important pests of Cruciferous or Brassicaceaefamily plants in regions of Shahriar, Kahrizak and Sahr’e Ray and every year its damage can be seen on the leaves of these plants. In order to study the seasonal population fluctuation of P. rapae, One hectare cauliflower field in the middle of a large field was randomly selected in five regions of cauliflower fields in southof Tehran were chosen and sampled every 10 days. Each plant was presumed as a sampling unit and sample size was determined as 20 host plants and all eggs, larvae and pupa on the host plant were recorded. Results of this study showed that Jahanabad and Shahed fields had the highest egg density (18.91±5.60) and the lowest egg density (16.53±4.04) was seen in the Playin field during season. In the Shahed field, highest egg density occurred in June 19 and the lowest egg density was seen on October 25. In the Playin field, the highest and lowest egg density was seen on September 29 and June 19, respectively. In the Jahanabad field the highest (2.99±0.66) and lowest (0.41±0.10) larval density was occurred during the season among different regions. Highest density was observed in the Jahanabad field during the harvest time on October 25 and the lowest larval density was seen on June 19. The highest and lowest larval density was seen in the field of Playin  on 25rd October and 19th June, respectively. Kahrizak (0.87±0.16) and Playin (0.19±0.05) fields had the highest and lowest pupal density in different regions during the season. In the field of Kahrizak, highest pupal density was occurred on 25rd October and in the playin field, the lowest pupal density was seen on 19th June. In the Playin field, highest density of pupae was occurred on 14th October and 25rd October and the lowest density of pupae was observed on 19th June and 2th July, respectively. The results showed that number of larval and pupal stages based on units density, between all experimental regions and Shahed university station had not significant difference.

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