CORRELATION BETWEEN PREDATOR GREEN LACEWING CHRYSOPERLA CARNEA (STEPHENS,1836) AND SEASONAL PRESENCE OF JASMINE WHITEFLY ALEUROCLAVA JASMINITAKAHASHI IN SOME CITRUS SPEACIES.

Abstract

Seasonal presence of jasmine whitefly Aleuroclava jasmini Takahashi correlated to the predator Chrysoperla carnea (Stephens) were studied in 25000m² citrus of orchard (citrus, orange and clementine) During March 2014 to September 2015 at An Numaniyah city south of Iraq. The population density of jasmine whitefly showed a significant deference between the upper and lower height rate of trees125.1 and 90.8 nymph/1 cm2 leaf area, respectively. Statistical analyses showed highest population density rate on orange trees was 139.3 nymph/1 cm2 leaf area followed by citrus and clementine with 104.5 and 80.0 nymph/1 cm2, respectively. For the interaction, the highest population density rate was registered on orange with 164.4 nymph/1 cm2 at the lower height level. Effect of host correlated to season, orange registered the highest population density rates comparison citrus species with 214.4, 164.0 and 125.9 nymph/1 cm2. Compared to other seasons, population density rates were the highest in summer season with 281.9, 128.3 and 101.5 nymph/1 cm2. In addition, orange registered the highest population density rate comparison to other citrus species at summer season. The distribution of jasmine whitefly through the year, registered Population density 55, 25 and 20% respectively on summer autumn and spring seasons. The two insects were correlated in positive relationship. The lacewing population density reflected during the study period. The predator showed an obvious increase when scored 50.8 egg/ 160 leaves in March. Then the highest lacewing rate was registered in July with 250.6 egg per 160 citrus leaves. When jasmine whitefly population density decreased, the rate started to decrease and scoring 30.9 egg/160 leaves in November.