Mahrous,, M., Basha, A., lbrahim, M., Ismail, S., Lokma, M. (2006). OBSERVATIONS ON AESTIVATION,DISPERSAL AND BREEDING SEASON OF THE GLASSY CLOVER SNAIL Monacha cartusfana MULLER AT SHARKIA GOVERNORATE. Journal of Plant Protection and Pathology, 31(8), 5487-5486. doi: 10.21608/jppp.2006.235243
M. E. Mahrous,; A. E. Basha; Mervat H. lbrahim; Sh. A. Ismail; M. H. Lokma. "OBSERVATIONS ON AESTIVATION,DISPERSAL AND BREEDING SEASON OF THE GLASSY CLOVER SNAIL Monacha cartusfana MULLER AT SHARKIA GOVERNORATE". Journal of Plant Protection and Pathology, 31, 8, 2006, 5487-5486. doi: 10.21608/jppp.2006.235243
Mahrous,, M., Basha, A., lbrahim, M., Ismail, S., Lokma, M. (2006). 'OBSERVATIONS ON AESTIVATION,DISPERSAL AND BREEDING SEASON OF THE GLASSY CLOVER SNAIL Monacha cartusfana MULLER AT SHARKIA GOVERNORATE', Journal of Plant Protection and Pathology, 31(8), pp. 5487-5486. doi: 10.21608/jppp.2006.235243
Mahrous,, M., Basha, A., lbrahim, M., Ismail, S., Lokma, M. OBSERVATIONS ON AESTIVATION,DISPERSAL AND BREEDING SEASON OF THE GLASSY CLOVER SNAIL Monacha cartusfana MULLER AT SHARKIA GOVERNORATE. Journal of Plant Protection and Pathology, 2006; 31(8): 5487-5486. doi: 10.21608/jppp.2006.235243
OBSERVATIONS ON AESTIVATION,DISPERSAL AND BREEDING SEASON OF THE GLASSY CLOVER SNAIL Monacha cartusfana MULLER AT SHARKIA GOVERNORATE
2Plant Protection Research Institute. Dokki . Giza.
Abstract
Aestivation. dispersal and breeding season of the glassy clover snail
Mcarfusiana were studied in Egyptian clovers fields at Sharkia Governorate during
the period from April 2001 to June 2002. It was found that. snails aestivate during
summer months under plants grown in the irrigation canals. Sugarcane was the most
preferable one followed by elephant grass. while bermuda grass was the least one in
this respect. General means of aestivated snails in 50 x 50 cm. under the
aforementioned plants were 207.57. 168.52 and 70.67 snails, respectively. In April. a
relatively low numbers enter aestivation. These numbers were gradually increased to
reach the maximum values during June or July depending on aestivation site
However, in September and October numbers of aestivated snails were sharply
decreased. The majority of aestivated snails were seen with epiphragm during June
July and August. Moreover. in Octot or. high numbers of epiphragms were observed
on soil surface at or near aestivation sites.
In December all aestivated snails became active and moved from aestivation
sites under bunches of elephant grass grown in irrigation canal to the adjacent clover
field and few of them reached a distance of 15 m far from irrigation canal. As the
distance increased numbers of recovered snails were obviously decreased. Starting
from January numbers of counted snails were increased to reach the peak during
March or April with values of 37.0 (52.7). 33.3 (26.1). 23.7 (16) and 17.5 (12.7
individuals in 50x50 cm. at 1.5. 5. 10 and 15 m farfrom irrigation canal. respectively
In May these figures were sharply decreased. while in June snails were not detected
in the field. They were aggregated under bunches of elephant grass. All snails
counted during November and December were found in adult stage. while most of
those counted during January. February and March were found in juvenile stage.
The breeding season of Mcarfusfana in Egyptian clover fields lasted three
months starting from mid-November to mid-February. Numbers of clutches and eggs
were changed during the breeding season according to time of sampling and distance
from aestivation sites. More clutches were laid during November and December as
compared to those in low numbers which laid during January and February. On the
other hand. the highest numbers of egg clutches were deposited in the adjacent five
meters near the aestivation sites. while at 10 and 15 m low numbers of egg clutches
were laid. Clutch size tended to increase in the beginning of egg-laying period. but
showed a noticeable decrease in its second half. It ranged between 8 to 41
eggsfclutch with grand mean of 22.31 eggs 7 clutch.
Top