A Preliminary Study on the Biology of the Icerya jacobsoni
In order to clarify the identification and biology of Icerya jacobsoni,the study used outdoor sim-ulated natural conditions to observe and record the biology of I.jacobsoni at different developmental stages.The results showed that male and female I.jacobsoni had different life histories and typical sexual dimorphism,and their eggs were yellowish or creamy white,with smooth and glossy translucent shells;the 1st instar larvae were ovoid,yellowish and active when they first hatched;the 2nd instar larvae were covered with yellow ciliate hairs around the body,and formed 20 waxy protrusions around the body,with the two terminal protrusions merging;The 3rd instar larvae were only females and resemble adult females;the nymphs were only males and were free from the nymphs;the adult females were oval,orange-red in colour,covered with a large amount of white wax powder,and were larger,with longer wax protrusions;the males were small and elongated,with two fleshy pro-trusions at the end,each with 7-10 hairs.The main behavioral habits of each form are also different.
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