2. Number of field generations:
Data present in fig (1 and 2) and Table (2 and 3) indicated that the cottony camellia scale, P.floccifera has one annual generation, and these results were ensured throughout the two years of study of the insect population under field condition at Assiut governorate. The number of generations was taken from the annual number of peaks of nymphs. During the first year of investigation, the percentage of nymph population recorded 78.81%of the total population through March. Almost similar trend has been obtained in the 2nd (2014/2015), where one annual generation existed. Nymphs population peaked in March (79.21%) also. This agreed with Hallaji-Sani et al. (2012) findings in Iran P.floccifera has one annual generation …show more content…
Fig (2) Total number of different developmental stages of Pulvinaria floccifera on 48 leaflets of 4 Cycas revolute trees at Assiut district, 2014/2015. 3. Monthly Variation Rate (M.V.R.):
3.1. 2013/2014 season:
The estimated monthly variation rate (M.V.R.) was intimated in Table 2. The monthly variation rate of the population density of the cottony camellia scale demonstrate that the favorable periods for the insect development and increasing found to be from November to March. The prevailing environmental conditions during these months were ranged from 15.42 to 21.11°C and from 55.75 to 63.87% R.H., which seem to be suitable for the pest multiplication. The highest value of (M.V.R.)was recorded on December (1.56), which mean that the conditions of 15.47°C and 63.87%R.H. are seemed to be the optimal for P.floccifera population to growth and build up. 3.2. 2014/2015 …show more content…
Data presented in Table 4 indicated that the simple correlation between mean temperature and relative humidity, and the population of M. flavus was approximately similar to that of the first season. Multiple-regression analysis revealed that the efficiency of mean temperature occupied the same site (83.49%), whereas, the relative humidity recorded (0.83%). Data of both seasons, concerning the population dynamic of M. flavus revealed that the population of this parasitoid species was approximately synchronized with the pest population. The lowest population of M. flavus was recorded during summer months during both seasons. This may be because of high temperature and low humidity during this period (see Table 2 and 3) and, the ornamental plants are not well foliaged, because of its small size, as fruit trees in order to provide enough protection from direct sun. Also, the pest population during that time was in its lowest numbers and this may be makes the suitable pest stage for parsiting is not available. Abd-Rabou and Badary (2004) recorded M. flavus associated with the cottony camellia scale, P. floccifera in Egypt. Morsi (2010) mentioned that M. flavus has three peaks of parasitism on Saissetia coffeae (Walker) in March, June and September. Schneider et al., 1983 stated that M. flavus reached its maximum level of abundance on the Florida wax scale,
Data present in fig (1 and 2) and Table (2 and 3) indicated that the cottony camellia scale, P.floccifera has one annual generation, and these results were ensured throughout the two years of study of the insect population under field condition at Assiut governorate. The number of generations was taken from the annual number of peaks of nymphs. During the first year of investigation, the percentage of nymph population recorded 78.81%of the total population through March. Almost similar trend has been obtained in the 2nd (2014/2015), where one annual generation existed. Nymphs population peaked in March (79.21%) also. This agreed with Hallaji-Sani et al. (2012) findings in Iran P.floccifera has one annual generation …show more content…
Fig (2) Total number of different developmental stages of Pulvinaria floccifera on 48 leaflets of 4 Cycas revolute trees at Assiut district, 2014/2015. 3. Monthly Variation Rate (M.V.R.):
3.1. 2013/2014 season:
The estimated monthly variation rate (M.V.R.) was intimated in Table 2. The monthly variation rate of the population density of the cottony camellia scale demonstrate that the favorable periods for the insect development and increasing found to be from November to March. The prevailing environmental conditions during these months were ranged from 15.42 to 21.11°C and from 55.75 to 63.87% R.H., which seem to be suitable for the pest multiplication. The highest value of (M.V.R.)was recorded on December (1.56), which mean that the conditions of 15.47°C and 63.87%R.H. are seemed to be the optimal for P.floccifera population to growth and build up. 3.2. 2014/2015 …show more content…
Data presented in Table 4 indicated that the simple correlation between mean temperature and relative humidity, and the population of M. flavus was approximately similar to that of the first season. Multiple-regression analysis revealed that the efficiency of mean temperature occupied the same site (83.49%), whereas, the relative humidity recorded (0.83%). Data of both seasons, concerning the population dynamic of M. flavus revealed that the population of this parasitoid species was approximately synchronized with the pest population. The lowest population of M. flavus was recorded during summer months during both seasons. This may be because of high temperature and low humidity during this period (see Table 2 and 3) and, the ornamental plants are not well foliaged, because of its small size, as fruit trees in order to provide enough protection from direct sun. Also, the pest population during that time was in its lowest numbers and this may be makes the suitable pest stage for parsiting is not available. Abd-Rabou and Badary (2004) recorded M. flavus associated with the cottony camellia scale, P. floccifera in Egypt. Morsi (2010) mentioned that M. flavus has three peaks of parasitism on Saissetia coffeae (Walker) in March, June and September. Schneider et al., 1983 stated that M. flavus reached its maximum level of abundance on the Florida wax scale,