|Table of Contents|

Spatial Distribution Characteristics of Gymnosporangium yamadae  Spots on Apple Leaves(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2017年08
Page:
119-123
Research Field:
Publishing date:

Info

Title:
Spatial Distribution Characteristics of Gymnosporangium yamadae  Spots on Apple Leaves
Author(s):
TANG Xiaoqin; LU Jie; ZANG Jiancheng
(Tibet Agricultural and Animal Husbandry College，Linzhi，Tibet 860000)
Keywords:
apple tree; Gymnosporangium yamadae spots; spatial distribution characteristics; Gongbu Nature Reserve; Tibet
PACS:
-
DOI:
10.11937/bfyy.201708027
Abstract:
Apple trees are the main tree species of the economic forest in the southeast area of Tibet，which have a serious hazard of Gymnosporangium yamadae in recent years.Apple trees which distributed in Gongbu Nature Reserve of Tibet were used as research objects.Based on the field investigation，spatial distribution pattern of G.yamadae spots on apple leaves which distributed in Gongbu Nature Reserve of Tibet were studied by diffusion coefficient C，Morisita index I，Cassie index Ca，mean crowding M*，Lloyd patchiness index，negative binomial parameter K，Iwao regression analysis，Taylor power index.The results showed that the quantitative characteristics of G.yamadae spots on the apple leaves were as follows,the middle part>the lower part>the upper part，the west>the east>the north>the south.The number of G.yamadae spots on apple leaves accounted for 39.33% for the middle part，19.32% for the middle left，20.01% for the middle right，31.53% for the lower part，15.37% for the lower left and 16.16% for the lower right;29.14% for the upper part，14.70% for the upper left and 14.44% for the upper right.That of the left and right was 49.39% and 50.61%，respectively.The G.yamadae spots on the apple leaves mainly existed as 10-40 aggregation forms.30≤b<40 was the most，the number of G.yamadae spots accounted for 17.36% of the total.The spatial distribution pattern of G.yamadae spots on the apple leaves was aggregated type，but the aggregation intensity was not great.The individual clump size of G.yamadae spots was not static，and it increased with G.yamadae spots density increasing，the average value was 48.42.The IwaoM*-m model of spatial distribution pattern was M*=0.997 2+5.686 8m (R2=0.999 9) for G.yamadae spots on apple leaves，and the Taylor power model was log(S2)=0.148 3+1.633 2log m (R2=0.956 8).The G.yamadae spots belonged to aggregation distribution at all densities by the two models，and the aggregation intensity increased with the increasing of the G.yamadae spots density.The study results provided the foundation for sustainable control of G.yamadae.

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Last Update: 2017-05-05