This study was conducted at El-Mansoura district, Dakahlia Governorate during September-October 2011 on pea plantation to evaluate the efficiency of certain biocides compared with some Molluscicides against Monacha sp. Land snails on laboratory and field. Results can be concluded that Biogard, Cranch, Protecto and Vertimec were used with 1, 2 and 3 % concentrations as leaf dipping technique. LC50 and LC90 values were (2.84 and 18.75 %), (1.97 and 4.57 %), (4.99 and 25.29 %) and (0.63 and 2.56 %), respectively. While LC50 and LC90 as poison bait fore mention before biocides were (2.04 and 37.3%), (2.08 and 5.97 %), (3.45 and 19.50 %) and (0.51 and 2.13 %), respectively in laboratory. Results of the field experiments showed that the tested biocides reduced Monacha sp. Population density on pea plantation with low values, except, Vertimec (83.32%) after 21 days residue effect. While Molluscicides were the most effective (up to 90 %) to population density reduction of land snails infesting pea plantation compared with tested biocides compound.
To study the structure-activity relationship, a triterpenoidal saponin and a triterpenoidal saponins rich extract (of Zygophyllum coccenum) were proven to be inactive. Thus, the activity is associated with the steroidal, not triterpenoidal saponins. Moreover, a spirostane aglycone without sugar moiety, was found to be inactive and attained the activity by glycosidation.
Terrestrial gastropods (snail and slug) species were studied concerning their occurrence survey and population density in 25 localities representing five districts of Kafr EL-Sheikh Governorate, during September 2015 to August 2016. An attempts to obtain basic information concerning their relationships between land snail species assemblage and soil properties .Ten herbivorous species, eight land snails and two land slugs' species belonging to three families Helicidae, Succinidae, Limacidae of order Stylomatophora were found on different crops. Population density of Land snails and slug species varied in their incidence and level of infestation according to each locality and host type. Soil samples were taken from five districts due to analytical chemically and assess the relationships between low or high snail population density and soil component. There is positive relation between terrestrial gastropods population and soil calcium content. Organic matter, soil PH and salinity (EC, electric conductivity) with low and high density in all districts were average [(1.2 and 2.9), (7.54 and 9.01) and (1.54 and 4.52)] respectively. It is clearly that Organic matter, soil PH and EC had negative correlation with land gastropods low or high densities. However, the quantitative species composition of the land snail assemblage is related to soil properties to a lower degree than snail density and species richness, and other habitat characteristics such as vegetation can be important for species abundance.
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