Abstract
A field trial was done at 2018-2019 cotton seasons to evaluate the parasitoid of Trichogramma evanescens (Westwood) local strain which rearing for 12th generation under normal conditions in the laboratory; compared with the conventional insecticide applications profenofos (organophosphorus compound); for controlling the two pests pink bollworm, Pectinophora gossypiella (Saund.) and spiny bollworm, Earias insulana (Boisd.) on infested cotton green bolls. The real control effect (pest population and infestation reductions percentages) by T. evanescens was determined through the weekly infestation level of green cotton bolls comparing with the control. When T. evanescens was released in comparison with profenofos insecticide treatment, caused more reduction of pink and spiny bollworms infestation when used as 3&5 cards than profenofos comparing with untreated at two seasons, respectively. Pest control by releasing T. evanescens levels was relatively lower as 1 card parasitoid than 3 as well as 5 cards. Also, the infestation reduction was high when this parasitoid was releasing in cotton earlier in the season without any other control agents. The obtained results show that the release of T. evanescens to control pink and spiny bollworms is biologically effective and could be used as an important agent in integrated pest management programs.
Highlights
In Egypt, up to now the pink and spiny bollworms considerable the major pests of cotton, the infestation in cotton by two pests increasing day-by-day (Naranjo, 1993)
The culture of P. gossypiella (Saunders) and E. insulana, eggs used in this experiment was obtained from laboratory rearing on an artificial diet that was previously described by (Amer 2015), for several generations away from any contamination with insecticides, Table 1. 2.3.Mass Rearing Parasite Technique: For mass rearing the parasitoid; S. cerealella eggs < 24 hr old were glued to paper cards (10x15 cm.) and exposed to T. evanescens adults in glass jars (2-liters capacity) provided with 10% sucrose solution for the adult parasite nutrition and covered with clothwrapped cotton kept in position by a rubber band
A field trial release for the efficacy of the eggs parasitoid, Trichogramma evanescens used alone compared with the insecticide applications against the pink bollworm, Pectinophora gossypiella (Saund.) and spiny bollworm, Earias insulana (Boisd.) was evaluated during the two cotton-growing seasons, 2018 and 2019
Summary
In Egypt, up to now the pink and spiny bollworms considerable the major pests of cotton, the infestation in cotton by two pests increasing day-by-day (Naranjo, 1993). The two pests’ lays eggs on squares, flowers and green bolls where the destructive larvae of pink or spiny bollworm usually devour flower buds, bolls and seeds therein (Kandil, 2001) The increase in used the chemical insecticides for controlling insect pests on cotton plants resulted in many side effects such as; pollution in the air, increase pesticide residues in agriculture crops and their products to residue toxicity on crops, in addition, pest resistance to various classes of pesticides. There are a growing necessity and interest in the use of biological control agents in cotton fields for the management of insect pests. S.M. Salem program (IPM) program in cotton fields when the parasitoid (trichogrammatid egg parasites) released in combination with insecticides or released only become worldwide against many lepidopterous especially the pink and spiny bollworms pests( Hassan, 1994)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
