Looking after roses is difficult because they often get eaten by insects and so need to be sprayed regularly with insecticide
It is difficult to care for roses because they are often attacked by insects and so need spraying regularly
Roses are difficult to grow because they attract insects and so often need spraying.
「バラは虫に食われやすいから消毒が大変」＝ Looking after roses is difficult because they often get eaten by insects and so need to be sprayed regularly with insecticide / It is difficult to care for roses because they are often attacked by insects and so need spraying regularly / Roses are difficult to grow because they attract insects and so often need spraying.
ボキャブラリー
バラ ＝ rose
虫 ＝ insects
食われやすい ＝ often get eaten by / often attacked by
消毒 ＝ insecticide （＝虫を殺す液体）
look after / care for / grow ＝ （植物を）育てる
difficult ＝ 難しい、大変
regularly ＝ 定期的に
spray ＝ しぶきを飛ばす
attack ＝ 狙う
イギリス 
