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Dutch elm disease, which is caused by the fungus C. ulmi spread by adu

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Dutch elm disease, which is caused by the fungus C. ulmi spread by adu [#permalink]

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New post 29 Jul 2017, 23:53
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Question Stats:

82% (01:19) correct 18% (01:51) wrong based on 94 sessions

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Dutch elm disease, which is caused by the fungus C. ulmi spread by adult scolytid beetles, has already destroyed 70 percent of the elms in Greenwood Forest. Another naturally occurring fungus, P. oblonga, kills larvae of the scolytid beetle. Forest rangers plan to introduce P. oblonga into Greenwood Forest in order to save the remaining mature elms.

Which of the following, if true, would cast the most serious doubt on the plan's prospects for success?

(A) During the last year, the scolytid beetle population in Greenwood Forest has decreased by 30 percent because of cold-weather conditions.

(B) Dutch elm disease cannot be abated by introducing chemical compounds used to arrest the diseases of many other species of tree.

(C) Introduction of P. oblonga saved elm trees in neighboring Gatemar and Lavemont forests.

(D) For P. oblonga to control scolytid beetles successfully, it must be established in a forest prior to the beetle infestation.

(E) Greenwood Forest has lost many maple trees because of a fungus infection.
[Reveal] Spoiler: OA

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Re: Dutch elm disease, which is caused by the fungus C. ulmi spread by adu [#permalink]

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New post 07 Aug 2017, 07:04
Dutch elm disease, which is caused by the fungus C. ulmi spread by adult scolytid beetles, has already destroyed 70 percent of the elms in Greenwood Forest. Another naturally occurring fungus, P. oblonga, kills larvae of the scolytid beetle. Forest rangers plan to introduce P. oblonga into Greenwood Forest in order to save the remaining mature elms.

Which of the following, if true, would cast the most serious doubt on the plan's prospects for success?

(A) During the last year, the scolytid beetle population in Greenwood Forest has decreased by 30 percent because of cold-weather conditions.

(B) Dutch elm disease cannot be abated by introducing chemical compounds used to arrest the diseases of many other species of tree.

(C) Introduction of P. oblonga saved elm trees in neighboring Gatemar and Lavemont forests.

(D) For P. oblonga to control scolytid beetles successfully, it must be established in a forest prior to the beetle infestation.

(E) Greenwood Forest has lost many maple trees because of a fungus infection.


i didnt understand the reason. I have answered A

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Re: Dutch elm disease, which is caused by the fungus C. ulmi spread by adu [#permalink]

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New post 07 Aug 2017, 07:34
My answer is D.

D says that P.oblonga must be introduced before beetle infestation. So as per plan if P.Oblonga introduced now, there would be no effect. Plan won't save remaining trees.

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Re: Dutch elm disease, which is caused by the fungus C. ulmi spread by adu   [#permalink] 07 Aug 2017, 07:34
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Dutch elm disease, which is caused by the fungus C. ulmi spread by adu

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