Poplar and willow flocculation inhibition test has achieved initial success in our city; "flying catkins obscuring the sky" is expected to be alleviated.

From: Lianyungang Updated: 2019-04-08 09:34

Every　year　at　the　turn　of　spring　and　summer,　willow　catkins　and　poplar　catkins　will　flutter　in　the　sky,　which　not　only　affects　the　landscape　environment　of　urban　and　rural　roads,　but　also　troubles　the　general　public.　Last　May,　the　municipal　Housing　and　Construction　Department　invited　the　professional　prevention　and　control　personnel　from　Sichuan　to　select　willow　and　poplar　trees　in　Cangwu　Green　Park　and　Yuzhou　Park　to　carry　out　flocculation　inhibition　pilot　tests　respectively.

According　to　reports,　the　prevention　and　control　personnel　have　different　principles　to　suppress　catkins　flocculation　in　the　two　test　sites.　In　Cangwu　Green　Park,　the　staff　selected　chemical　treatment　method　to　treat　willow　and　poplar　trunks　through　“injection”　to　inhibit　estrogen　in　female　plants　and　inhibit　their　germination　and　differentiation,　so　that　trees　will　focus　on　leaf　growth.　Stimulating　female　plants　to　blossom　less　or　not　can　achieve　the　goal　of　reducing　the　next　year's　flocculation.　The　other　is　a　physical　method,　which　is　used　to　test　poplar　trees　in　Yuzhou　Park.　The　preventive　and　control　personnel　use　natural　degradable,　liquid-type　fly-floc　inhibitors　with　the　help　of　sprinkler　high-pressure　water　gun　or　fog　gun　truck　to　spray　directly　on　the　surface　of　trees.　By　capturing,　adsorbing　and　agglomerating　flocs,　they　lock　them　in　the　mesh　structure　and　play　the　role　of　wetting,　bonding　and　fixing　flocs.　This　method　achieved　the　purpose　of　fixing　fly-flocs　last　year,　but　the　experiment　was　only　carried　out　locally.

In　Cangwu　Green　Park,　the　journalist　found　that　six　willows　in　the　pilot　experiment　of　flocculation　suppression　last　year　had　already　sprouted,　but　the　earing　rate　was　significantly　lower　than　that　of　the　oak　willow,　and　10　poplars　in　the　experiment　also　had　fewer　ears.　The　spike　rate　of　willow　and　poplar,　both　male　and　female,　decreased　significantly　after　using　the　medicine.　The　technology　will　not　affect　the　growth　of　trees,　but　can　restrain　flocculation　while　making　the　growth　of　trees　more　flourishing.　The　main　phytogenic　pollution　in　our　city　is　the　flying　flocs　produced　by　female　poplar　and　willow　trees.　Poplars　and　willows　belong　to　fast-growing　native　tree　species　with　fast　shading　and　good　greening　effect.　There　are　a　large　number　of　plantations　in　urban　and　rural　areas　of　our　city.　Cangwu　Green　Park　and　Yuzhou　Park　have　more　plantations　of　them　in　urban　areas.　Chaoyang　East　Road　and　Xingang　City　Avenue　are　also　partly　planted　with　the　trees.　According　to　the　working　staff　in　charge　of　the　municipal　housing　construction　department,　our　city　will　follow　up　and　study　the　effect　of　the　test.　If　the　results　of　the　two　parks　test　are　obvious,　poplar　and　willow　trees　in　the　main　sections　of　urban　areas　can　be　gradually　promoted　and　harnessed　in　recent　years.　At　the　same　time,　we　need　to　increase　the　observation　density,　do　a　good　job　of　the　effect　tracking　and　gradually　promote　the　use　of　the　test　in　the　whole　city,　so　as　to　gradually　solve　the　problems　caused　by　willow　and　poplar　catkins.

In　addition　to　artificial　control　of　flying　flocs,　relevant　departments　have　considered　replacing　green　tree　species.　At　the　same　time,　landscape　experts　also　carried　out　"birth　control"　on　part　of　Ligustrum　lucidum　at　Yingzhou　South　Road　last　year,　that　is,　to　reduce　the　pollution　of　its　mature　purple　and　black　seeds　on　the　road　surface　through　the　use　of　inhibitors.