题目内容
大豆菌核病此病初侵染为主,再侵染对本病影响不大。
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实行2-3年的轮作,就可以降低大豆菌核病的发生。
Billy: Happy birthyday, Mary!Mary: Thank you!Billy: Here is a gift for you._______1___________.Mary: What a lovely dog! Thank you very much.Billy: Don't mention it. And Lucy and I ______2______________.Mary: It's so kind of you.Billy: ____________3__________________. Your new shirt goes well with your skirt.Mary: Maybe you won't believe this, but it was made by my grandmother.Billy: Really? _____4________.Mary: Thank you.Billy: Here comes the cake.Mary: What a lovely cake!Billy: Be sure to blow out all the candles in one puff.Mary: Oh, they all went out!Billy: Did you make a wish?Mary:Yes, but I doubt if it will come true. It never comes true.Billy: Well, _____5_________.
大豆霜霉病菌以____在病残体上或种子上越冬。
大豆霜霉病种子上附着的卵孢子是最主要初侵染源。
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