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The annual presence of the Mealybug Nipaecoccus viridis (Newstead) with the predator Chrysoperla carnea (Stephens) in Wasit. | ||
| journal of kerbala university | ||
| Article 1, Volume 10, Issue 1, 2014, Pages 49-55 PDF (0 K) | ||
| Abstract | ||
| The annual occurance of Mealybug Nipaecoccus viridis (Newstead) was studied in an orchard of about 10 Donums planted sour orange in Numaniya province of Wasit.In the period from March 1st 2012 to the 28th Febreuary 2013.The Maelybug infestation percentage showed that insect occurred throughout all monthes of the year.Two peaks of infestation percentage were recorded,the first during May June and July months to reach its peak in the August (30 %) with ( 45C°and 26%R.H.),the second peak occurred during the months of September and October and declined then gradually down to (4%) with(17c°and 69%R.H. ) during the cold winter months,In contrast the population densities of the insect coincide to that of infestation percents rates where the insect population have two peaks also,the first continued during the months May,June and July to reach its peak during August (45Female/100 leaves) and the second peak during September and October (36 Female / 100 leaves),then it start to decrease until reaching (4 Female/100 leaves) during cold winter months .65 % of the females distributed on the upper leaf surface while 21%,14% on the lower leaf surface and it’s.petiole respectively. The Predator Chrysoperla carnea was associated with the Mealybug and occurred in flactuated density in all months, it’s densities showed two peaks , the first during the months of June and July to reach its peak during August ( 16 eggs / 100 leaves) and the second peak was in autumn to reach its peak at the end of November ( 22 eggs/ 100 leaves) and low population density was recorded during the winter (4 eggs /100 leaves).The predator had no hibernation period. | ||
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