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The Seasonal Density of Aphids and Ladybugs of a Seven Points Coccinella suptempunctata on Alfalfa Crop | ||
| Journal of Tikrit University For Agriculture Sciences | ||
| Article 1, Volume 17, Issue 0, 2017, Pages 105-111 | ||
| Authors | ||
| Shaymaa A.-kh. Alhamawandy; Sammar M. Najem; Sali E. Abdrazaq; Samer S. Ali | ||
| Abstract | ||
| the study results showed that Aphis fabae has been present throughout the study period densities population there are two peaks of the aphid, first in the second week of the month of November, reaching 18 insect / m2 and receded population density after recording its highest appearance, a second peak in the second week of December and the population density of 22 insect / m2 And continued intensity of black peas presence and until second week of February, and then increased population density quickly in the week of February to reach the population density to 11 insect / m2 and continued population density decline throughout the month of March, then rose in the first week of April, and then the population density decline and gradually began starting from the second week of April and continued to decline until the second week of May to 2 insect / m2 ..The results showed that Myzus persicae (Sulzer) has existed in small numbers on alfalfa crop ranged prepared during the study period (1-4) insect, the first appearances was in the first week of November, reaching population density 1 insect /m2 then increased population density in the second week of December, amounting to 3 insect / m2, and Declined population density after recording the highest presence in the first and second of April the week amounted to 4 insect / m2. As for the insect from jet trout Therioaphis maculata results showed that the first appearance in the second week of February population density reached 1 insect / m2, then increased population density quickly In the first week of March as population density has reached 3 insect / m2then decreased thereafter during the following weeks of March until the last week of March where it began population density to rise to reach peak reached 4/ m2 in the first week of April , then the population density decreased gradually from the third week of April and continued to decline until the second week of May to 2 adult / m2 . The Coccinella suptempunctata was the population density in the first week of the study amounted to 3 adult / m2to be launched upward until the last week of February, and then increased population density rapidly in the first week of the November amounted to 6 adult / m2 continued population density growing, which peaked 54 adult / m2 in the last week of April, and then fell population density and gradually until the end of the study period, which is the second week of May, where the population density of 12 adult / m2 . The extent of the relationship between the presence of an insect from jet trout and Coccinella suptempunctata has been observed where the notes from beginning to increase population density for those who jet spotted at the beginning of the month of April and then followed by an increase in the population density of the ladybird with seven points at the end of April, has been accompanied by the emergence of a predator with debut insect jet of trout the first week of February. | ||
| Keywords | ||
| seasonal density; aphids; ladybugs; coccinella suptempunctata; alfalfa crop | ||
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