Task: Class Definition Understanding (ontology: Food_Agriculture/Crop_Ontology)

Which of the following definitions best describes 'Yellow stem borer deadheart damage assessment'?

A. At maximum tillering, observe the proportion of tillers that have stems with deadheart caused by Scirpophaga incertulas. Use an augmented experimental design with a susceptible check replicated at intervals across the whole trial. Dissect stems from 10 hills of susceptible checks at maximum tillering, panicle initiation and late ripening, in order to identify the SB species. The test is considered a valid test for resistance if the susceptible check has more than 20% of tillers with deadheart
B. Stain polished (milled, white) rice grains with a weak KI-I solution, prepared by mixing 0.1% I2 solution with 0.2% KI solution, and observe the colour of the stained endosperm
C. Sow plants in a greenhouse with a uniform high population of green leafhopper, and observe the damage on seedlings
D. Estimate the severity of damage caused by thrips

Answer: At maximum tillering, observe the proportion of tillers that have stems with deadheart caused by Scirpophaga incertulas. Use an augmented experimental design with a susceptible check replicated at intervals across the whole trial. Dissect stems from 10 hills of susceptible checks at maximum tillering, panicle initiation and late ripening, in order to identify the SB species. The test is considered a valid test for resistance if the susceptible check has more than 20% of tillers with deadheart