*3.6.1 Plant varieties used in the experiment*

The plant varieties referred to in the **Table 1** below and the companies producing them were obtained from the local markets for the sale of agricultural supplies.

*3.7.2 Measuring the severity of CMV infection*

*DOI: http://dx.doi.org/10.5772/intechopen.96587*

plants in terms of the degree of each plant [102].

A guide (**Table 2**) to the severity of the infection was made by Prof. Maadh Abdel Wahab Al-Fahad, consisting of six degrees to know the development of the apparent symptoms on the plants. It was calculated by the number of affected

*The Activity of New Bio-Agent to Control* Cucumovirus Cucumber Mosaic Virus *(CMV)*

Severity of infestation% ¼ ð Þ 0 � 0 grade of plants number þ … þ 5 � 5 grade of plants number *=* ð5 � examined for plants total numberÞ � 100

**Photo Description The degree of**

(3)

**injury**

5

Healthy 0

Light mosaic 1

Severe mosaics on the leaves 2

Severe mosaic and beginning wrap the leaves 3

Intense yellowing, mosaic and severe leaf curl 4

Severe mosaic and leaf wrap With deformations and shortening of the leaf space

**Table 2.**

**159**

*Disease index of severity of CMV infection, by Dr. Maadh Alfahad.*
