Açıklama

Many insects cause direct and in direct damage
to plants.Direct damage ranges from sucking
liquid from the plants to marks on the leaves.Much
more serious indirect damage is determined by
the fact that some insects are carriers of viruses
and this causes a reduction of production, fruit
malformation and withering of the plant until
it dies.
The insects most frequently affecting plants
(especially the tomato) are Trialeurodes
vaporariorum better known as the “white fly”
which transmits generic viruses, Bemisia tabaci
and Frankliniella occidentalis which respectively
transmit the Tomato Spotted Wilt Virus (TSWV)
and the Tomato Yellow Leaf Curl Virus (TYLCV)
Chemical and microbiological control means
are undoubtedly effective in terms of their power
for controlling insects, but before being killed
by the insecticide used in the greenhouse, they
prick the plant and transmit the Virus damage
on tomatoes.
To prevent insects from entering greenhouses,
a physical barrier is now used. This is a woven
mesh with different mesh sizes according to
the insect to be defended from. This type of
protection is used all over the world and prevents
virus carrying insects from entering and keeps
down insecticide treatment for controlling other
harmful insects.