Within-Plant Distribution of Bemisia tabaci (Homoptera: Aleyrodidae) Adults and Immatures on Greenhouse-Grown Winter Cucumber Plants

2007 ◽  
Vol 100 (4) ◽  
pp. 1160-1165 ◽  
Author(s):  
Maolin Hou ◽  
Wei Lu ◽  
Jihui Wen
Keyword(s):  
Bemisia Tabaci ◽  
Plant Distribution

Seasonal Abundance and Within-Plant Distribution of Parasitoids of Bemisia tabaci (Homoptera: Aleyrodidae) in Peanuts

1993 ◽  
Vol 22 (5) ◽  
pp. 1043-1050 ◽  
Author(s):  
Heather J. McAuslane ◽  
Fred A. Johnson ◽  
David A. Knauft ◽  
Daniel L. Colvin
Keyword(s):  
Bemisia Tabaci ◽  
Plant Distribution ◽  
Seasonal Abundance

scholarly journals Distribution Pattern of Sweet Potato Whitefly Bemisia tabaci (Gennadius) on Tomato Plants

1997 ◽  
Vol 2 ◽  
pp. 43
Author(s):  
K.M. Azam ◽  
S.A. Razvi ◽  
M.H. AI-Muhthuri ◽  
A.A. AI-Raeesi
Keyword(s):  
Bemisia Tabaci ◽  
Sharp Decrease ◽  
Plant Distribution ◽  
Tomato Plants ◽  
Ovipositional Preference ◽  
Dispersion Patterns ◽  
Egg Density ◽  
Middle Strata ◽  
Lower Plant ◽  
Temporal Dispersion

A field experiment was conducted to study the intra plant distribution and temporal dispersion patterns of whitetly (Bemisia tabaci Gennadius) eggs and nymphs on tomato plants to establish a sampling method which would give accurate estimates of the population size. From the third week to the ninth week after transplanting, terminal leaflets were collected from the outer and inner canopies of each of the upper, middle, and lower plant strata. A strong ovipositional preference was found in whitefly adults at an early crop age. A maximum of 50.6% of the eggs were deposited in the middle stratum followed by upper (36. 15%) and lower strata (13.3%). However, most of the nymphs (65.5%) were present in the lower stratum followed by middle (32.4%) and upper strata (2. l %). These findings indicated that when taking observations in egg counts the most preferred site is the upper and middle strata while for nymphal counts it is the lower and middle strata. There was a sharp decrease in egg and nymphal counts from the seventh week after transplantation which clearly indicated that, after this age , the corp is not preferred by whitefly . Egg and nymphal population of whitefly on tomato plants in the field were distributed in aggregates as evident by high variance to mean ratio. Values ranged from 2.72 to 14.36 and 4.52 to 21.82 for egg counts and nymphal population, respectively.  Aggregation of whitefly eggs and nymphs in all cases might be due to the behavior of adults to congregate and to the heterogeneity of the environment . The appropriate number of leaflets required for the estimation of egg density at 10% and 20% error was found to be 149 and 37, respectively. In the case of nymphal population the numbers were 163 and 41 at 10% and 20% error, respectively.

Control of the Bemisia tabaci/Tomato yellow leaf curl virus complex on protected tomato crops in Algarve (Portugal)*

EPPO Bulletin ◽  
2002 ◽  
Vol 32 (1) ◽  
pp. 31-35
Author(s):  
A. F. Arsenio ◽  
E. Neto ◽  
N. Ramos ◽  
S. Mangerico ◽  
E. Fortunato ◽  
...  
Keyword(s):  
Bemisia Tabaci ◽  
Tomato Yellow Leaf ◽  
Yellow Leaf ◽  
Virus Complex ◽  
Leaf Curl Virus ◽  
Leaf Curl

Some Curious Facts in Plant Distribution

1896 ◽  
Vol 41 (1065supp) ◽  
pp. 17016-17017
Author(s):  
W. Botting Hemsley
Keyword(s):  
Plant Distribution
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