DAMAGE AND LOSSES ASSESSMENT BY SOME LAND SNAILS ON SOME PLANTINGS IN CERTAIN RESTRUCTURED REGIONS AND ITS CONTROL

Abstract

ABSTRACT Soheir Mohamed Abd El-haleim Mohamed: Damage and losses assessment by some land snails on some plantings in certain restructured regions and its control. Unpublished Ph.D. Thesis, Institute of Environmental Studies & Research, Ain Shams University, 2022. The present research includes studying some ecological studies, food consumption and preferences, damage assessment in addition to toxicological studies of applying several plant extracts, natural compounds and chemical pesticides on the terrestrial snail species Eobania vermiculata. Terrestrial snails infested many field crops, vegetables, fruits and ornamental plants at Giza and Beheira Governorates. Ecological studies indicated that, three species of terrestrial snails are belonging to family (Helicidae), Eobania vermiculata and Theba pisana were recorded at Nobaria destrict, Beheira Governorate and the heavy infestation of E. vermiculata and T. pisana were recorded on fruit trees, such as Orange, Mango and Apple. While Eobania vermiculata and Monacha obstructa were recorded at Mansouria Village, Giza Governorate and the heavy infestation of M. obstructa was recorded on cucumber and Egyptian clover. Also, E. vermiculata was recorded heavy infestation on fruit trees, orange, mango, grape and pear. The population dynamics was carried out during two successive seasons (2018-2019 and 2019-2020) at Nobaria destrict, Beheira Governorate. Results revealed that, the highest population density of E. vermiculata was detected in March (2018-2019) and (2019-2020) on orange trees 107.40 and 92.00 snails10 trees-1 respecteviely. The correlations between some climatic factors, showed significant effect on number of E. vermiculata during season (2019-2020) on apple and Mango. On the other hand, the highest population density of T. pisana was recorded in Spring season especially in March (2018-2019) on orange trees 61.10 snails 10 trees-1. Also, temperature showed significant effect on number of T. pisana in orange and apple but high significant in mango during (2018-2019) season and relative humidity showed significant effect during (2019-2020) season.