Resistance in Sorghums to the Banks Grass Mite12

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Abstract
Oligonychus pratensis (Banks) exhibited no differential preference response for SC 599-6, a previously identified mite resistant sorghum line, when given a choice of that sorghum or a susceptible grain type (Tx 7000), a grassy sorghum (KS 30), or a sweet sorghum (Honey). However, a greater preferential response was recorded for any sorghum line at plant growth stages 2–6 vs. stage 1, 7, and 8. Life span duration did not significantly differ when the mite was reared on SC 599-6, SC 56-6, Tx 7000, B Tx 378, KS 30, ‘Sweet Sudan’ or Honey sorghums. Mites reared on intact sorghum leaves at growth stages 1–6 had a longer life span (25.7 days) and ovipositional period (11.6 days) than mites reared on sorghum leaf discs at growth stages 6–8 (19.1 and 8.9 days, respectively). However, fewer eggs (4.3) were oviposited daily by females on sorghums at growth stages 1–6 than on sorghums at growth stages 6–8 (11.1). Tolerance appeared to be a major resistance mechanism of SC 599-6 sorghum as test results indicated less damage occurred to that line even when infested with mite populations equal to that on susceptible Tx 7000 or Honey sorghum.

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