Show wh whiskers I 1 on red clover due to bug potato leaf hopper always attacks smooth variety prepared by th the 0 un united I 1 led states state department of agriculture red clover la in th the e united states grows whiskers that stand straight out from the sterna steins of the plants while in england the ancestral form of tho the american type la Is still comparatively free from hairiness in attempting nn an explanation of tile tho change from the smooth to tile the hairy form dr A J cleters of the united states department of agriculture says saya it la Is necess necessary zary to turn to the wild red clover closer to to which all clovers cloers ure gre related and which shows a tendency toward hairiness tile the possibility of producing in plants was therefore in the blood of abo relatively smooth type brought frow england mora than years aso ago he fie says sas furthermore a few rough halry plants may luny have occurred in fields seeded with the 1 ing ng clovers v when this english clover was brought to america it encountered new conditions mining among them thein u little insect not known in ili europe mid and called the potato leaf hopper this insect lai nages red doer clover especially the sil lOoth forms doing the lie most injury to the second or seed croie doctor saya it alwais keeps heeps down doin the of the lie smooth plants plant of ru ku clovers grown in ili the united states so they will not seed all the tha halry hairy american type Is little affected especially when there aro are smooth plants on which the lent leaf hoppo hopper can call feel feed A reasonable inference says doctor Pl eters may be drawn from whitt Is 14 known to caplen today and from froin the tj e I 1 known anon facts the most reasonable answer to the question of why american clover Is halry hairy la Is that the constant attacks of the lent leaf hopper carried can led on an for more than one hundred years ears grad bally eliminated the smooth form forin by keeping down clown the production of seed while the rough halry form produced produce more seed than the other and so con scantly increased |