Asparagus aphid feeding and freezing damage asparagus plants
Valenzuela, H.R. | Bienz, D.R.
Asparagus aphid [Brachycorynella asparagi (Mordvilko)] feeding without freezing reduced vigor of asparagus (Asparagus officinalis L.), as measured by crown size, fern growth, root necrosis, and bud number, but did not greatly reduce short-term survival. Freezing dormant crowns for 24 hr at -4.5C killed some crowns and reduced vigor of survivors. Aphid feeding and freezing were synergistic; they reduced survival and vigor of survivors to a much greater extent than either aphid feeding or freezing alone. Aphid feeding resulted in early budbreak and precocious growth. A method for counting aphids per plant was developed.
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