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Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
Sponsored by:Chinese Society of Entomological;institute of zoology, chinese academy of sciences;
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Your Position :Home->Past Journals Catalog->2019年56 No.1

Damage caused by two kinds of scale insect on Pyrus sinkangensis
Author of the article:ZHANG Bei1** Adil·Sattar1*** Yasin·Ghopur2 ZHOU Wei-Feng
Author's Workplace:1. College of Forestry, Xinjiang Agricultural University, Urumqi 830052, China; 2. Korla Harayama Forestry Station, Korla 841000, China
Key Words: Quadraspidiotus slavonicus (Green); Quadraspidiotus perniciosus (Comstock); damaging characteristics; harm stage; diffusion pattern
Abstract:

 [Objectives]  To clarify the cause of the red spot on Pyrus sinkangensis, identify the scale insects that damage the fruit of this species and how these spread. [Methods]  The damage caused by two kinds of scale insect were observed during the development of pear fruit by artificially inoculating P. sinkangensis at fixed points. The subsequent spread of these pests was monitored using the hanging yellow board method. [Results]  During the the fruit growing period, second generation nymphs of Quadraspidiotus perniciosus crawl onto the fruit and cause the spots visible on the surface of fruit in the middle of July. Dark red spots occur where the fruit is reddish and dark green spots when damage occurs in unpigmented areas. Early stage fruit are harmed by 1st instar nymphs of Quadraspidiotus slavonicus (Green). 1st instar nymphs of this species drift on the wind to pear leaves and fruits from adjacent poplar forests causing red spots to appear on the surface of fruit in late May and early June. When the wind scale was about 2-3, 1st instar nymphs of Q. slavonicus dispersed a maximum of 50 m and the mean number caught on yellow sticky boards under these conditions was 0.011 per one cm2. When the wind scale was about 5-6, 1st instar nymph could disperse up to 150 m, and the mean number caught on yellow sticky boards was 0.239 per one cm2. [Conclusion]  The red spots on young fruit of P. sinkangensis are caused by 1st instar nymphs of Q. slavonicus. Important factors influencing the spread of this pest to P. sinkangensis orchards are the height of the poplar forest zone, the wind force, and the number of insects. Spots on pears during the P. sinkangensis fruit growing period (mid-July) were caused by 2nd generation nymphs of Q. perniciosus.

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