Relationship between Kilifia acuminata (Signoret) and chlorophyll percentage loss on Mango leaves.
Nabil H. A.
Author Affiliation: Plant Protection Research Institute, ARC, Dokki, Egypt.
Journal of Entomology 10 : 110-114
Abstract : Feeding injury caused by mango shield scale, Kilifia acuminata (Signoret) (Hemiptera: Coccidae) reduced leaves chlorophyll content significantly between infested and uninfested leaves. Quantification of chlorophyll loss caused by K. acuminata feeding on mango leaves is vital importance for photosensitize and later on crop yield. The uninfested leaves had higher levels of chlorophyll in comparison with infested ones. The study was conducted in Plant Protection Research Institute, ARC, Egypt from April to June 2012 on mango shield scale, K. acuminata to calculate chlorophyll percentage loss on mango leaves variety Shmama. Simple correlation and partial regression were done between numbers of insect and chlorophyll loss percentage in infested and uninfested unites (inch2). Positive highly significant effect was recorded between numbers of insect and percentage of chlorophyll loss. Chi-square (?2) was used to calculate economic threshold and economic injury levels for K. acuminata that causes economically damage in disk chlorophyll content. Economic threshold and economic injury levels were 3 and 8 individuals per disk, respectively.