دراسة بعض الخصائص الحياتية للحشرة القشرية Ceroplastes rusci L. و كثافتها العددية على أشجار التين في شمال العراق

الملخص EN

Some biological features and population density for Ceroplastes rusci L.

were conducted during the season 2012-2013 on the fig trees in the region of Qarnaw,Koisanjaq,Erbil, under laboratory conditions(Average of Temp.

26.33°c and Humidity 53.4%.

The study revealed that, three generations could be identified in the insect's life cycle,starting in the last week of April.

The highest mean number of eggs laid by the single female of the first generation was (1795.73), and the lowest of the third generation was (840.5).The mean period of the eggs incubation was(7,8 ,and 27)days, and the percentage of hatching was(90 ,40.5 ,and 55.7 % at a mean of temperature 25 , 35.8, 18.2°c and humidity 55.4 ,39.3 ,and 65.5 % for the three generations respectively.

The wintry hibernation for the insect as a stable ,second or third nymph instar ,started in the last week of January.

The results have shown that there is a significant difference of the insect numbers on tree parts, which reached (180.5 ,8.6 ,78.4 ,20.3 ,7.4 ) ,(78.8 ,12.6,11.5 ,26.1 , 24 ) and (161.7 ,26.9 ,23.6 , 11.1 , 28.5 )insects on the following tree parts (a branch of 20 cm.

in length , one squared inch of the lower leaf surface ,one squared inch of the upper leaf surface ,fruits and petiole, for the three generations respectively.