8th INTERNATIONAL WHEAT CONFERENCE

PReSeNT STATuS of SuNN PeST (euRygASTeR
INTegRICePS) IN kyRgyzSTAN
Abdybek Asanaliev 1 , Olga Mayboroda 2 , Dimitry Ten 3 ,
Omorbek Mambetov 4 , Abduhakim Islamov 5 , Ernazar
Baltabaev 1,5 , Jayl Bolokbaev 1,5 , Arne Hede 5
1 Kyrgyz Agrarian University, Bishkek, Kyrgyzstan
2 Kyrgyz National University, Bishkek, Kyrgyzstan
3 State Commission for Variety Testing, Bishkek, Kyrgyzstan
4 Plant Protection Department. Ministry of Agriculture, Bishkek, Kyrgyzstan
5 Sida Seed Industry Development Project, Bishkek, Kyrgyzstan
Email: asanaly61@mail.ru
Sun Pest is a serious biotic pest in Kyrgyzstan which in certain years can cause significant
economical losses for farmers due to its devastating effect on bread making quality.
Surveys conducted by the Kyrgyz Plant Protection Department in the Chui Valley during
2006 and 2007, demonstrates typical numbers of 0.5-2.0 adults per square meter during
the spring time. Similar surveys indicates that the most critical period is during the tillering
stage during which 40% of plants can die with Sunn pest numbers of 3-5/m2 and
70% with 8-10 Sunn pest/m2.
In order to obtain a better understanding of the yearly variation in Sunn pest appearance
and development, surveys were conducted in the Chui valley during the years 2001-
2007 during which the period was observed for appearance of overwintering adults in
the wheat fields, beginning of egg laying, development of nymphs and the appearance of
a new generation of adults. This data was correlated to climatic information like average
monthly temperature and number of days with rain to assess the climates influence on
Sunn pest development.
The data indicates that the earliness by which overwintering adults are observed in the
spring to a large degree depends on temperature and humidity. In general overwintering
adults are observed in the fields in mid April, but in years with cold and wet springs (like
2003) the appearance of adults are delayed until end of April while in rather warm and
dry springs adults can be observed as early as the end of March or beginning of April (like
2005). Interestingly, the temperature during the winter months (January and February)
seem to have little or no influence on the appearance of overwintering adults, as 2003 was
among the warmest winters and 2005 among the coldest.
Despite the variation in appearance of overwintering adults, the egg laying period is
rather constant from beginning to mid May, indicating an optimal period for this stage
of Sunn pest development, and some sort of “synchronization” of development. This is
demonstrated by a less number of days (shorter period) from appearance of adults to appearance
of eggs in 2003 compared to 2005.
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