Protection Organization, PPO 2011). The speed of Trichogramma development in
crops such as tomato and maize was very high, while after initial decline on other
crops, it reached a steady level (such as rice) and in other crops was negative (such as
apple) (Fig. 17.3). Nevertheless, the last data showed a decline in the application area
for the Trichogramma.
Fig. 17.2 Annual amount of released number (million individuals) of (a) Trichogramma species in
18 provinces (kg) and, (b) Harbobracon hebetor in 20 provinces through 2018–2019. (Data from
PPO 2020)
17 Analytical Approach to Opportunities and Obstacles of Iranian Biological. . .
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