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LATE LEAF SPOT MANAGEMENT STRATEGIES...

THEBERGE, ROBERT LAURIER.

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LATE LEAF SPOT MANAGEMENT STRATEGIES FOR PEANUT PRODUCTION IN SOUTH CHINA (CERCOSPORIDIUM, PERSONATUM).

Record Type:	Electronic resources : Monograph/item
Title/Author:	LATE LEAF SPOT MANAGEMENT STRATEGIES FOR PEANUT PRODUCTION IN SOUTH CHINA (CERCOSPORIDIUM, PERSONATUM)./
Author:	THEBERGE, ROBERT LAURIER.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1983,
Description:	87 p.
Notes:	Source: Dissertation Abstracts International, Volume: 44-01, Section: B, page: 8000.
Contained By:	Dissertation Abstracts International44-01B.
Subject:	Plant pathology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8312673

LATE LEAF SPOT MANAGEMENT STRATEGIES FOR PEANUT PRODUCTION IN SOUTH CHINA (CERCOSPORIDIUM, PERSONATUM).
THEBERGE, ROBERT LAURIER.

LATE LEAF SPOT MANAGEMENT STRATEGIES FOR PEANUT PRODUCTION IN SOUTH CHINA (CERCOSPORIDIUM, PERSONATUM). - Ann Arbor : ProQuest Dissertations & Theses, 1983 - 87 p.

Source: Dissertation Abstracts International, Volume: 44-01, Section: B, page: 8000.

Thesis (Ph.D.)--The Pennsylvania State University, 1983.

The epidemiology and crop loss relationships of late leaf spot of peanuts (Cercosporidium personatum (Berk. and Curt.) Deighton) were studied in South China to provide information necessary for developing integrated pest management (IPM) strategies for commercial peanut (Arachis hypogaea L.) production in that region. Field plot studies were conducted at the South China Agricultural College research farm near Guangzhou (Canton), the People's Republic of China, during the fall 1981 cropping season. Sampling techniques were developed that allowed disease assessment at relatively low levels of disease. Analyses of these results demonstrated that epidemic onset apparently occurs early in the fall crop season. Manipulation of disease progress, as judged by apparent infection rates, was possible with a few timely applications of chlorothalonil. Multiple stress factor crop loss models demonstrated the importance of several stress factors, including late leaf spot on peanut yields.Subjects--Topical Terms:

3174872
Plant pathology.

LATE LEAF SPOT MANAGEMENT STRATEGIES FOR PEANUT PRODUCTION IN SOUTH CHINA (CERCOSPORIDIUM, PERSONATUM).
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035 $a (MiAaPQ)AAI8312673
035 $a AAI8312673
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100 1 $a THEBERGE, ROBERT LAURIER. $3 3347946
245 1 0 $a LATE LEAF SPOT MANAGEMENT STRATEGIES FOR PEANUT PRODUCTION IN SOUTH CHINA (CERCOSPORIDIUM, PERSONATUM).
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1983
300 $a 87 p.
500 $a Source: Dissertation Abstracts International, Volume: 44-01, Section: B, page: 8000.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 1983.
520 $a The epidemiology and crop loss relationships of late leaf spot of peanuts (Cercosporidium personatum (Berk. and Curt.) Deighton) were studied in South China to provide information necessary for developing integrated pest management (IPM) strategies for commercial peanut (Arachis hypogaea L.) production in that region. Field plot studies were conducted at the South China Agricultural College research farm near Guangzhou (Canton), the People's Republic of China, during the fall 1981 cropping season. Sampling techniques were developed that allowed disease assessment at relatively low levels of disease. Analyses of these results demonstrated that epidemic onset apparently occurs early in the fall crop season. Manipulation of disease progress, as judged by apparent infection rates, was possible with a few timely applications of chlorothalonil. Multiple stress factor crop loss models demonstrated the importance of several stress factors, including late leaf spot on peanut yields.
520 $a Traditional leaf spot control methods, including backpack equipment, a sulfur complex fungicide, and common spray schedules, were compared to chlorothalonil and ultra low volume controlled droplet applicators to see if measurable benefits could be gained. The phytotoxicity of the sulfur complex reduced the desirability of this fungicide relative to chlorothalonil. Disease control was virtually equal with the two types of sprayers.
520 $a Late leaf spot forecasting methods were tested to see if a few well-timed applications of chlorothalonil could significantly control the disease and improve peanut yields. The University of Georgia's weather based peanut leaf spot forecasting system was tested and found to be too conservative to give adequate disease control when the number of sprays was limited to a maximum of three. A second forecasting method, termed "subsequent sampling," relied on a sampling procedure which called for a limited number of applications at critical thresholds of disease incidence. Significantly better disease control and higher plot yields were obtained when three applications of chlorothalonil were scheduled by this method.
520 $a Economic analysis of the use of chlorothalonil was made to determine if the cost of a foreign manufactured pesticide could be justified. Benefit/cost ratios of increased peanut yields to pesticide costs gave ratios as high as 5.6:1.
590 $a School code: 0176.
650 4 $a Plant pathology. $3 3174872
690 $a 0480
710 2 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertation Abstracts International $g 44-01B.
790 $a 0176
791 $a Ph.D.
792 $a 1983
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8312673