BIOLOGY, ECOLOGY AND MOLECULAR IDENTIFICATION OF Eobania vermiculata (MÜLLER) PHENOTYPES INFESTING CERTAIN FRUIT ORCHARDS IN BEHAIRA GOVERNORATE, EGYPT

Faculty Agriculture Year: 2025
Type of Publication: ZU Hosted Pages:
Authors:
Journal: Zagazig J. Agric. Res., faculty of agricultural Zagazig university Volume:
Keywords : BIOLOGY, ECOLOGY , MOLECULAR IDENTIFICATION , Eobania vermiculata (MÜLLER)    
Abstract:
Land snails are considered one of the most destructive agricultural pests. A survey was carried out on three orchards of fruit trees, namely navel orange, mango, and guava, in Behaira Governorate from January 2020 to December 2021. It was found that individuals of the brown garden (chocolate-banded) snail, Eubania vemiculata (Muller), were present in the three orchards throughout the entire year with varying values according to season and host plant with two phenotypes: banded brown color and unbanded pale-yellow color. The identified phenotypes varied in percentage occurrence from one orchard to another. The relative percentages of adults with banded brown color and unbanded pale-yellow color on navel orange, mango, and guava during 2020 were 51.22% & 48.18 %, 51.13% & 48.17%, and 56.21% & 43.19%, respectively. While the corresponding values during 2021 were 54.11% & 46.10%, 54.15% & 45.15%, and 52.13% & 47.17%, respectively. Oranges harbored the highest numbers followed by mango and guava. with mean values of 20.51 (21.47), 14.93 (15.57), and 15.13 (15.56) snails per sample, respectively. The values of E.vermiculata population density gradually increased after winter months to reach the maximum values during the summer or autumn months. It was observed that adults were more abundant during the summer months, i.e., June, July, August, and September. In contrast, juveniles were more prevalent during February, March, and April. Snails of E. vermiculata laid their eggs for about 3.5 months, starting from mid-October 2020 to the end-January 2021. The eggs were spherical with a mean diameter of 3.3 ± 0.35 mm. The number of clutches and eggs laid by E. vermiculata significantly (P≤0.05) changed during the breeding season. Shell measurements of E. vermiculata showed a mean shell height of 20.20 mm ranging from 16.60 to 23.80 mm, while the mean diameter was 26.65 mm, with a range of 22.70 to 30.60 mm. Shell thickness ranged between 0.73 to 0.89 mm with a mean of 0.81mm. The mean aperture diameter was 9.04 mm, which ranged between 8.18 to 9.89 mm. On the other hand, the number of whorls ranged between 4.5 to 6.0. and the animal color is banded brown or unbanded pale yellowish. The dendrogram of genetic distances among populations based on band polymorphisms generated by RAPD-PCR using the two primers showed that the two populations (p1& p3) can be identified as the banded brown phenotype, while the two populations (p2 & p4) can be classified as an unbanded paleyellow phenotype of the land snail, E. vermiculata
   
     
 
       

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