Effects of intercrop on frit fly, oscinella frit, oviposition and larval survival on oats
1979
The possibility of using clover as undercover in oat crop to reduce frit fly oviposition was investigated in the laboratory. Oviposition sites at the base of oat seedlings are normally the most preferred by gravid females. Clover density of 18 g seed/m² forming an undercover at the base of oat seedlings acted as mechanical barrier which interfered with oviposition behaviour and reduced the number of eggs laid. Strip-sown clover within the rows of oats was as effective as broadcast application of clover seeds among oat plants, in reducing oviposition. Ovipositing females utilized the less preferred oviposition sites at higher locations on oat seedlings, when the preferred sites at the base were no longer accessible. However, the total number of eggs laid at the former was fewer than in the latter. Larval survival from eggs deposited at higher locations on the plants was also very poor.
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