Plague-of-Locusts-蝗虫灾害完整版.pptx

Everyseveralyears,partsofAfricaarelikelytobecoveredbyadarkcloud,alivingcloudmadeofbillionsoflocuststhataretravellingacrossthecontinenteatingeverythingintheirpath.PlagueofLocusts

Plagueoflocustsisaworldwidedisasterofbiologicalagriculture.Therearenearly100countriesorregionshavebeenattackedbyit.EspeciallyinAsiaandAfrica.

Thedroughtmakesthelocustslargelyreproduceinaveryshorttimebecausetheylikethewarmanddryweather.Adryenvironmentisgoodfortheirreproductionandgrowth.Thedrysoilwiththewatercontentbetween10percentand20percentisthebestconditionforthelocusts’spawning.?Thefirstcause:Drought

Thesecondcause:livinghabits1.Theyhavegregarious(合群旳)habits.2.Theyhavestrongfertility.3.Theyarepolyphagous(eatingmanykindsofplants).4.Theirflyingabilitiesarestrong.5.Theireggsaredeepundertheground,andarehardtobedestroyed.

Thethirdcause:thewarmwinterWiththeglobalwarming,especiallythetemperaturerisinginwinter,thesurvivalrateoflocustsbecomeshigh.Andthegrasslands’degradationsupportstheavailableplacesfortheirspawning.thegrasslands’degradationnearQilianMountains

ThepreventivemeasuresProtectingtheenvironmentThelocustsmusteggonthelandswiththecoverageofvegetationunder50percent.Ifwedowelltoprotectenvironment,andimprovetheweather,itwillpreventtheplague.

2.UsingthepharmaciesItissuggestedthatthehighefficient,lowpoisonousandlowresidualpesticidesbeused.

3.Usingthenaturalenemies,Thelocustshavemorethan60naturalenemies,includingbirds,amphibians,reptilesandsoon.Insomeplaces,ducks,chickens,orspidersproduceagoodeffect.草原“牧鸡“----蝗虫旳天敌

TheplagueoflocustsinChinaTheplagueoflocustshashappenedmanytimesinChina.TheregionsaremainlyintheprovincesofHebei,Henan,andShangdong,andalsoinShanxi,