Incidence, Distribution and Characteristics of Major Tomato Leaf ...
Incidence, Distribution and Characteristics of Major Tomato Leaf ... Incidence, Distribution and Characteristics of Major Tomato Leaf ...
Incidence, distribution and characteristics of major tomato leaf curl and mosaic virus diseases 126 Rainfall (cm) A Temperature ( C °) B Mean Whitefly No. C Mean TYLCV diseased plants D C 50 40 30 20 10 0 25 20 15 10 5 0 20 15 10 5 0 1 0.8 0.6 0.4 0.2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Weeks from transplanting Figure 5.4: August (Week 1: 23-29 th Aug.) to (Week 12: 8-14 th Nov.) November, 1999¹ (A) Rainfall trends; (B) Temperature trends; (C) mean number of whiteflies trapped per m² in trial II; and (D) mean number of TYLCV diseased plants per plot in trial II. ¹ During the wet season, i.e.by the 13-18 th week the tomato crop had no more leaves due to Phytophora infestans blight disease infection, and whiteflies as well as TYLCV data collection was stopped.
Incidence, distribution and characteristics of major tomato leaf curl and mosaic virus diseases 127 Rainfall (cm) A Temperature (C º) B Mean Whitefly No. C Mean TYLCV diseased plants D 25 20 15 10 5 0 25 20 15 10 5 0 15 10 5 0 0.5 0.4 0.3 0.2 0.1 0 1 2 3 4 5 6 7 8 9 10 11 12 W eeks Weeks from from transplanting Figure 5.5: November 1999 (Week 1: 29 th Nov. to 5 th Dec.) – February 2000 (Week 12: 21-27 th Feb.) ¹ (A) Rain fall trends; (B) temperature trends; (C) mean number of whiteflies trapped per m² in trial III; and (D) mean number of plants showing TYLCV symptoms per plot in trial III ¹ Rainfall and temperature records stopped after the 12 th week in February, while whitefly and TYLCV infection records continued into March 2000
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<strong>Incidence</strong>, distribution <strong>and</strong> characteristics <strong>of</strong> major tomato leaf curl <strong>and</strong> mosaic virus diseases 126<br />
Rainfall (cm)<br />
A<br />
Temperature ( C °)<br />
B<br />
Mean Whitefly No.<br />
C<br />
Mean TYLCV diseased plants<br />
D<br />
C<br />
50<br />
40<br />
30<br />
20<br />
10<br />
0<br />
25<br />
20<br />
15<br />
10<br />
5<br />
0<br />
20<br />
15<br />
10<br />
5<br />
0<br />
1<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18<br />
Weeks from transplanting<br />
Figure 5.4: August (Week 1: 23-29 th Aug.) to (Week 12: 8-14 th Nov.) November, 1999¹ (A) Rainfall<br />
trends; (B) Temperature trends; (C) mean number <strong>of</strong> whiteflies trapped per m² in trial II; <strong>and</strong> (D) mean<br />
number <strong>of</strong> TYLCV diseased plants per plot in trial II. ¹ During the wet season, i.e.by the 13-18 th week<br />
the tomato crop had no more leaves due to Phytophora infestans blight disease infection, <strong>and</strong> whiteflies<br />
as well as TYLCV data collection was stopped.
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