المساعد الشخصي الرقمي

مشاهدة النسخة كاملة : لماذا لا يمكن نقل صفه مقاومة المبيدات الى نحل العسل



المستقبل
07-05-2008, 10:08 PM
تحيه طيبه وبعد
سلام الله عليكم و رحمته و بركاته
انا دارس في النحل ....


الى كل المشرفين و الاعضاء و الزوار ..الخ
لقد عرض على سؤل و لا اعرف اجابته و اريده ضرورى جدا
لماذا لا يمكن نقل صفه مقاومة المبيدات الى نحل العسل؟؟؟؟؟؟
ارجو ان تكون الاجابه علميه
انتظر اجابتكم على الرسائل الخاصه او التعليقات او الاميل الخاص
(titanic_3mr[at]yahoo.com)
وجزاكم الله خيرا

المستقبل
07-05-2008, 10:09 PM
يعنى محدش رد .............

Abdullah Ibrahim
19-12-2009, 10:22 PM
تحيه طيبه وبعد
سلام الله عليكم و رحمته و بركاته
انا دارس في النحل ....


الى كل المشرفين و الاعضاء و الزوار ..الخ
لقد عرض على سؤل و لا اعرف اجابته و اريده ضرورى جدا
لماذا لا يمكن نقل صفه مقاومة المبيدات الى نحل العسل؟؟؟؟؟؟
ارجو ان تكون الاجابه علميه
انتظر اجابتكم على الرسائل الخاصه او التعليقات او الاميل الخاص
(titanic_3mr[at]yahoo.com)
وجزاكم الله خيرا

Salamc Alikum, This the third time I treid to send you the answer to your question however, because of the time constrain I get myself disconnected. Any way the answer to your question is as follow. Insects are known for their ability to develop resistance to insecticides. There are many factors to developing resistance. In a population of insects there may be a few individuals that carry the genes for resistance. These genes arise from mutations and are rare 1%. Upon exposure to insecticides, insects that do not carry the resistance genes, 99%, die, thus allowing the individuals with the resistance genes to survive and reproduce, creating more resistant insects. With every generation the number of resistant insects increase. . Therefore, resistant development very costly to aa insect species. Honey bees like other insects develop resistant to chemicals. An example, if a farmer sprayed chemicals in his farma many of the bee colonieies will die, however, few colonies will stay alive. these few colonies are the one that are resoistant to the chemicals. In fact bees develop reistant, however, because the big loose of colonoies it seemes that bees don't develop resistance. The situation is the same with pests the majority die due to the chemicals application, however, since you cant see the humge mortality of it, all you see is that the pest is coming back and resist the chemicals. No both bees and pests die in great number and the 1% left are those responcible to develop a nresistant offspring. You can bred from theose alive colonies;however, it is not for the advantage of human because if these bees resistant to chemicals we are not and eating such honey is poison for us. Another example, if you analyze the honey in these survived colonies after the farmer spray chemicals you will find that the honey contain residue of that chemicals. If the residue exceed the limit, it will not be suitable for human consumption. There are bees and insects that tolerate different degreees of chemicals concentartion and by exposing bees or pests into these chemicals they become resistance to high doses of such chemicals. An example, a deadly dose of DDT for bees is 6 parts per million. Scientist have found that the bees in Brazil accumulate DDT in their bodies to concentrations as high as 42,000 parts per million. That is more than four percent of the bee's total body weight! Yet the bees show no ill effects from the DDT. Hope thisanswer your question. Salam Alikum :thumb1: