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Articles by Ryoko Tsutsumi
Total Records ( 2 ) for Ryoko Tsutsumi
  Abdul Razaq , Masaya Shiraishi , Pear Mohammad , Ryoko Tsutsumi and Junko Toda
  The changes in egg of citrus red mite, Panonychus citri (McGregor) Mari: Tetranychidae) during hatching were observed under scanning electron microscope. The egg was jewel-shaped having a diameter of 120-145 pm. The guy ropes and stalk broken down after two weeks of laying eggs. The characteristics of the shell surface gradually changed before hatching. The vertically patterned ridges appeared from the stalk base toward the middle portion of the egg. With the passage of time, the egg surface converted into deep patchy form. The embryo developed and the larva made a pair of hales in the middle region of egg using claws. The inside surface of the shell was smooth. The internal surface was spongy and external surface was patchy type having a thickness of 1 pm. The cleavage appeared on the equatorial portion of the egg and the larva came out. The deposited eggs had sticky wax materials on its ventral side for attachment on the leaf.
  Abdul Razaq , Pear Mohammad , Masaya Shiraishi , Ryoko Tsutsumi and Junko Toda
  The pattern of weaving by guy ropes in association with egg stalk was observed under scanning electron microscope in Panonychus citri (McGregor). The egg stalk was vertical having a base of 15.5 μm wide and its length was 146 μm. Initially few guy ropes extended from the tip of the stalk to the leaf surface of host plant. The ropes rolled up to 125 μm on the stalk tip and were stretched towards the surface. Several thin ropes combined together to form strong strand. The ropes were roughly surfaced and possessed granular materials. The development of new net was accomplished with further extension of thinner ropes, which were twisted over the thicker ones and pasted on the leaf. Mites used adhesive material for the fixation of threads on the leaf as well as for webbing. The thick guy ropes were segregated before sticking on the leaf surface. The surface of the leaf was covered with adhesive, which was invisible. Several ropes overlaps the hatching egg vertically and horizontally.
 
 
 
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