Economic Threshold, Injury Levels and Food Preference of Glassy Clover Snail, Monacha cartusiana (Muller) Infesting Strawberry Plants at Ismailia Governorate, Egypt.

Ibrahim A,M Lokma,M Issa

doi:10.21608/eajbsh.2017.16763

Ibrahim A, M Lokma + Show 1 more

Open Access

https://doi.org/10.21608/eajbsh.2017.16763

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Abstract

This study was carried out at Al Mahssama village, El Qassaseen district, and Ismailia Governorate during 2015 strawberry growing season. The paper aimed to assessment the economic damage threshold, economic injury levels and food preference of glassy clover snail, Monacha cartusiana (Muller) infested strawberry plants , Fragaria ananassa (Duchesne); festival cultivar using natural infestation (marking plants) and poison baits techniques. Also, two laboratory experiments were conducted to study food preference and consumption of M. cartusiana fed on three strawberry cultivars (Festival, Camarosa and Proprietary). The obtained results cleared that the values of economic damage threshold ETLs were less than economic injury levels EJLs, where the control measurements must be under taken. Therefore, the economic threshold is essential to determine the proper application time of control trial which would covalent in successful integrated pest management. The economic damage threshold of M. cartusiana on strawberry plants ranged 2-2.5 snail/plant, while the economic injury level ranged 3-7.5 snail/ plant. In addition, the results of laboratory experiments cleared that the food preference of M. cartusiana was varied as plant part and cultivar, where M. cartusiana snail preferred red fruits of Festival (39.02 mg/snail/day), green fruit of Proprietary (28.35 mg/snail/day) and fresh leaves of Camarosa (19.99 mg/snail/day) more than other tested food.

Highlights

The land snails become one of key pests infesting field, vegetable, fruit and ornamental crops in Egypt, especially in northern Governorates of Delta region
Proposed the concepts of an economic injury level (EIL) and economic threshold level (ETL) as rational comparison of the economic costs and benefits of pesticides use, EILs detected as the lowest number of pest cause economic damage, where the economic damage is the amount of damage that equal the control cost (Stern et al, 1959 and Pedigo et al, 1986)
Many authors have contributed to the understanding of host-land snail relationship, and much effort has been done towards developing damage assessment models and computing (Kassab and Daoud, 1964; El-Okda, 1984; Chang, 1991; El Massry, 1997, Ismail, 1997 and Ibrahim, et al, 2008)

Summary

Introduction

The land snails become one of key pests infesting field, vegetable, fruit and ornamental crops in Egypt, especially in northern Governorates of Delta region. Proposed the concepts of an economic injury level (EIL) and economic threshold level (ETL) as rational comparison of the economic costs and benefits of pesticides use, EILs detected as the lowest number of pest cause economic damage, where the economic damage is the amount of damage that equal the control cost (Stern et al, 1959 and Pedigo et al, 1986). Injury can be distinct as the effect of pest activities against host physiology or morphology, damage as the measurable loss of host utility, which is usually measured by reduction in the commodity yield or quality (Bardner and Fletcher 1974 and Pedigo et al, 1986). The effective infestation of land snails were varied as starting time from location to another and from crop to another (MohamedGhada, 2004 and Lokma, 2013)

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